Fair Value Measurements - Nonrecurring Measurements (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Impairment Charges From Continuing Operations | |||
| Impairment charges | $ 29,706 | $ 1,023 | $ 570 |
| Nonrecurring | Level 3 | |||
| Impairment Charges From Continuing Operations | |||
| Impairment charges | 31,625 | 1,023 | 1,336 |
| Nonrecurring | Level 3 | Operating Expenses | |||
| Impairment Charges From Continuing Operations | |||
| Impairment charges | 29,706 | 1,023 | 570 |
| Real estate | Nonrecurring | Level 3 | Operating Expenses | |||
| Impairment Charges From Continuing Operations | |||
| Fair Value Measurements | 14,850 | 0 | 0 |
| Impairment charges | 29,183 | 0 | 0 |
| CMBS | Nonrecurring | Level 3 | Operating Expenses | |||
| Impairment Charges From Continuing Operations | |||
| Fair Value Measurements | 400 | 1,478 | 1,808 |
| Impairment charges | 523 | 1,023 | 570 |
| Equity investments in real estate | Nonrecurring | Level 3 | |||
| Impairment Charges From Continuing Operations | |||
| Fair Value Measurements | 12,528 | 0 | 7,662 |
| Impairment charges | $ 1,919 | $ 0 | $ 766 |