Fair Value Measurements - Carrying Value and Fair Value Measurements (Details) - Level 3 - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Carrying Value | ||
| Fair Value, Balance Sheet Grouping | ||
| Non-recourse debt | $ 2,022,250 | $ 1,881,774 |
| Loans receivable | 31,500 | 44,044 |
| CMBS | 4,027 | 2,765 |
| Fair Value | ||
| Fair Value, Balance Sheet Grouping | ||
| Non-recourse debt | 2,053,353 | 1,937,459 |
| Loans receivable | 31,500 | 44,044 |
| CMBS | $ 7,470 | $ 8,739 |