Related Party Transactions (Narrative) (Details)
|
1 Months Ended |
12 Months Ended |
|
Apr. 30, 2021
USD ($)
|
Jan. 31, 2021
USD ($)
|
Nov. 30, 2020
USD ($)
|
Sep. 30, 2020
USD ($)
item
|
Dec. 31, 2020
USD ($)
ft²
property
item
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
| Related Party Transaction [Line Items] |
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| Revenue from leases |
|
|
|
|
$ 272,970,000
|
$ 302,409,000
|
$ 323,793,000
|
| Reimbursement expense |
|
|
|
$ 6,100,000
|
|
|
|
| General and administrative |
|
|
|
|
73,641,000
|
59,805,000
|
53,869,000
|
| Number of payments | item |
|
|
|
3
|
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|
|
| Mack [Member] |
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| Related Party Transaction [Line Items] |
|
|
|
|
|
|
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| Due from related parties |
|
|
|
|
0
|
0
|
|
| Marshall [Member] |
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| Related Party Transaction [Line Items] |
|
|
|
|
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| Due from related parties |
|
|
|
|
99,000
|
|
|
| Due to related party, Current |
|
|
|
|
|
120,000
|
148,000
|
| Accounts payable to related parties |
|
|
|
|
0
|
0
|
|
| RG [Member] |
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|
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|
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| Related Party Transaction [Line Items] |
|
|
|
|
|
|
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| Related party revenue |
|
|
|
|
0
|
674,000
|
1,114,000
|
| Bow Street LLC [Member] |
|
|
|
|
|
|
|
| Related Party Transaction [Line Items] |
|
|
|
|
|
|
|
| Reimbursement expense |
|
|
|
$ 6,100,000
|
|
|
|
| General and administrative |
|
|
|
$ 6,100,000
|
$ 6,100,000
|
|
|
| Number of payments | item |
|
|
|
|
3
|
|
|
| Payments for fees and expenses |
|
|
$ 2,100,000
|
|
|
|
|
| Leased Office Space 1 [Member] | Mack [Member] |
|
|
|
|
|
|
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| Related Party Transaction [Line Items] |
|
|
|
|
|
|
|
| Area Of Real Estate Property | ft² |
|
|
|
|
5,930
|
|
|
| Number of real estate properties | property |
|
|
|
|
1
|
|
|
| Lease expiration date |
|
|
|
|
January 2025
|
|
|
| Previously Leased [Member] |
|
|
|
|
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| Related Party Transaction [Line Items] |
|
|
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| Number of real estate properties | property |
|
|
|
|
1
|
|
|
| Previously Leased [Member] | Mack [Member] |
|
|
|
|
|
|
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| Related Party Transaction [Line Items] |
|
|
|
|
|
|
|
| Area Of Real Estate Property | ft² |
|
|
|
|
7,034
|
|
|
| Revenue from leases |
|
|
|
|
$ 48,000
|
$ 18,000
|
$ 193,000
|
| Scenario, Forecast [Member] | Bow Street LLC [Member] |
|
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| Related Party Transaction [Line Items] |
|
|
|
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| Payments for fees and expenses |
$ 2,000,000.0
|
|
|
|
|
|
|
| Subsequent Event [Member] | Bow Street LLC [Member] |
|
|
|
|
|
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| Related Party Transaction [Line Items] |
|
|
|
|
|
|
|
| Payments for fees and expenses |
|
$ 2,000,000.0
|
|
|
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|