Investments - Summary of Total Impairment Losses Recognized (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Investments in and Advances to Affiliates, Schedule of Investments [Abstract] | ||||
| Real estate and intangible asset impairment | $ 13,894 | $ 19,919 | $ 35,236 | $ 55,273 |
| Write-off of lease intangibles, net | 1,491 | 713 | 6,463 | 1,268 |
| Loans receivable impairment (recovery) | 0 | 338 | (324) | 338 |
| Total impairments from real estate investment net assets | 15,385 | 20,970 | 41,375 | 56,879 |
| Other impairment | 22 | 57 | 21 | 153 |
| Total impairment loss in continuing and discontinued operations | $ 15,407 | $ 21,027 | $ 41,396 | $ 57,032 |