Investments - Narrative (Details)
$ in Thousands |
3 Months Ended |
9 Months Ended |
12 Months Ended |
|
Sep. 30, 2018
USD ($)
Property
State
|
Sep. 30, 2017
USD ($)
|
Sep. 30, 2018
USD ($)
Property
receivable
State
|
Sep. 30, 2017
USD ($)
|
Dec. 31, 2017
USD ($)
Property
receivable
|
| Investment [Line Items] |
|
|
|
|
|
| Gross investment in real estate properties and loans |
$ 5,137,341
|
|
$ 5,137,341
|
|
$ 7,903,025
|
| Number of real estate properties | Property |
1,523
|
|
1,523
|
|
2,480
|
| Portfolio disbursement, number of states | State |
49
|
|
49
|
|
|
| Minimum of investment in real estate properties |
10.00%
|
|
10.00%
|
|
|
| Number of other notes receivable | receivable |
|
|
3
|
|
3
|
| Number of other notes receivable, secured | receivable |
|
|
2
|
|
1
|
| Number of other notes receivable, non-secured | receivable |
|
|
1
|
|
2
|
| Amortization amount to rental revenue for capitalized leases |
$ 1,300
|
$ 1,500
|
$ 4,200
|
$ 4,900
|
|
| Impairment of properties classified as held and used |
700
|
32,900
|
16,200
|
65,500
|
|
| Impairment of properties classified as held for sale |
600
|
4,800
|
1,000
|
22,600
|
|
| In-place leases |
|
|
|
|
|
| Investment [Line Items] |
|
|
|
|
|
| Leases amortization expenses |
7,000
|
$ 10,800
|
25,700
|
$ 33,000
|
|
| Secured Debt |
|
|
|
|
|
| Investment [Line Items] |
|
|
|
|
|
| Other notes receivable |
3,400
|
|
3,400
|
|
$ 3,500
|
| Unsecured Debt |
|
|
|
|
|
| Investment [Line Items] |
|
|
|
|
|
| Other notes receivable |
1,700
|
|
$ 1,700
|
|
|
| Commitment fee |
|
|
0.25%
|
|
|
| Financed Properties |
|
|
|
|
|
| Investment [Line Items] |
|
|
|
|
|
| Gross investment in real estate properties and loans |
$ 52,001
|
|
$ 52,001
|
|
$ 79,967
|
| Number of real estate properties | Property |
53
|
|
53
|
|
88
|
| Texas |
|
|
|
|
|
| Investment [Line Items] |
|
|
|
|
|
| Investment in real estate properties |
11.90%
|
|
11.90%
|
|
|