Related Party Transactions (Narrative) (Details)
$ / shares in Units, ft² in Thousands |
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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Aug. 31, 2017
USD ($)
ft²
parking_space
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Aug. 31, 2019
ft²
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Feb. 28, 2019
ft²
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Jan. 31, 2019
USD ($)
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Dec. 31, 2019
USD ($)
$ / shares
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Dec. 31, 2019
USD ($)
$ / shares
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Dec. 31, 2018
USD ($)
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Oct. 31, 2019 |
Sep. 30, 2019
USD ($)
employee
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May 31, 2018
USD ($)
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| Related Party Transaction [Line Items] |
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| Assets |
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$ 2,566,561,000
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$ 2,566,561,000
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$ 979,743,000
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| Management fee paid with common stock, period of restriction from selling stock |
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2 years
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| Management fee expense |
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$ 0
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| Management fee, transaction share price (in dollars per share) | $ / shares |
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$ 20.00
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$ 20.00
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| Management fee, percent, threshold |
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1.00%
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| Management fee, percent, threshold two |
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1.25%
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| Management fee, percent, threshold three |
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1.375%
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| Management fee, percent, threshold four |
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1.50%
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| Extension Term Master Lease Agreement |
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1 year
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| Termination fee, percent of prior years management fee |
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300.00%
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| Termination fee, minimum equity raised threshold |
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$ 820,000,000
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$ 820,000,000
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| Long-term debt, gross |
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1,396,143,000
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1,396,143,000
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546,693,000
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| General and Administrative Expense |
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| Related Party Transaction [Line Items] |
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| Expenses from transactions with related party |
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$ 7,500,000
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3,600,000
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| iStar Inc. |
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| Related Party Transaction [Line Items] |
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| Number of years as active real estate investor (over) |
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20 years
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| Real estate investments, aggregate transactions, value |
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40,000,000,000.0
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$ 40,000,000,000.0
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| Assets |
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$ 5,600,000,000
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| Entity number of employees | employee |
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157
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| iStar Inc. | General and Administrative Expense |
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| Related Party Transaction [Line Items] |
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| Expenses from transactions with related party |
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2,100,000
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1,500,000
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| Minimum |
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| Related Party Transaction [Line Items] |
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| Management fee, shareholders' equity, incremental threshold amount two |
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1,500,000,000.0
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1,500,000,000.0
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| Management fee, shareholders' equity, incremental threshold amount three |
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3,000,000,000.0
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3,000,000,000.0
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| Management fee, shareholders' equity, incremental threshold amount four |
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5,000,000,000.0
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$ 5,000,000,000.0
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| Ground leases term |
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30 years
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| Maximum |
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| Related Party Transaction [Line Items] |
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| Management fee, Shareholders' equity threshold amount |
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1,500,000,000.0
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$ 1,500,000,000.0
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| Management fee, shareholders' equity, incremental threshold amount two |
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3,000,000,000.0
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3,000,000,000.0
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| Management fee, shareholders' equity, incremental threshold amount three |
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5,000,000,000.0
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$ 5,000,000,000.0
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| Ground leases term |
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99 years
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| Class-A Office Building, Austin, Texas |
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| Related Party Transaction [Line Items] |
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| Ground Leases, Building, Number of Square Feet | ft² |
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310
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| Term of contract, initial lease term |
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99 years
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| 3333 LifeHope in Alpharetta, Georgia |
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| Related Party Transaction [Line Items] |
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| Ground leases, number of parking spaces to be constructed | parking_space |
185
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| Ground leases term |
99 years
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| Ground lease, future construction funding, percent authorized |
30.00%
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| Ground leases, additional construction, number of square feet | ft² |
160
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| 570 Washington Boulevard, Jersey City, NJ |
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| Related Party Transaction [Line Items] |
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| Ground Leases, Building, Number of Square Feet | ft² |
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420
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| Term of contract, initial lease term |
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98 years
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| Commitment II |
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| Related Party Transaction [Line Items] |
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| Term of contract, initial lease term |
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99 years
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| Real estate, leasehold improvement allowance |
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$ 10,500,000
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10,500,000
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$ 10,500,000
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| Ground lease, additional construction, funding commitment, term |
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21 months
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| Secured Debt |
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| Related Party Transaction [Line Items] |
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| Long-term debt, gross |
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1,396,143,000
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$ 1,396,143,000
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$ 546,693,000
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| Secured Debt | iStar Inc. | 3333 LifeHope Ground Lease Construction Loan | 3333 LifeHope in Alpharetta, Georgia |
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| Related Party Transaction [Line Items] |
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| Long-term debt, gross |
$ 24,000,000.0
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$ 19,900,000
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| iStar Inc. | iStar Inc. |
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| Related Party Transaction [Line Items] |
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| Noncontrolling Interest, Ownership Percentage by Parent |
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50.00%
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| Ground Lease Receivables | Sarasota Florida |
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| Related Party Transaction [Line Items] |
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| Ground lease, additional construction, funding commitment |
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$ 22,000,000.0
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| iStar Inc. | Commitment II |
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| Related Party Transaction [Line Items] |
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| Ground lease, additional construction, funding commitment |
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$ 13,300,000
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