Investments - Summary of Activity in Real Estate Assets Held for Sale (Details) $ in Thousands |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2017
USD ($)
Property
|
Dec. 31, 2016
USD ($)
Property
|
|
| Number of Properties | ||
| Balance, beginning of period (in properties) | Property | 44 | 36 |
| Transfers from real estate investments (in properties) | Property | 82 | 72 |
| Sales (in properties) | Property | (91) | (59) |
| Transfers to real estate investments held and used (in properties) | Property | (20) | (5) |
| Balance, end of period (in properties) | Property | 15 | 44 |
| Carrying Value | ||
| Balance, beginning of period | $ 160,570 | $ 84,259 |
| Transfers from real estate investments | 216,502 | 246,730 |
| Sales | (208,029) | (126,100) |
| Transfers to real estate investments held and used | (95,382) | (21,046) |
| Impairments | (24,732) | (23,273) |
| Balance, end of period | $ 48,929 | $ 160,570 |