Investments - Summary of Total Impairment Losses Recognized (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2017 |
Mar. 31, 2016 |
|
| Investments in and Advances to Affiliates, Schedule of Investments [Abstract] | ||
| Real estate and intangible asset impairment | $ 35,220 | $ 12,630 |
| Write-off of lease intangibles, net | (844) | 309 |
| Loans receivable recovery | 0 | (324) |
| Total impairments from real estate investment net assets | 34,376 | 12,615 |
| Other impairment | 0 | 3 |
| Total impairment loss | $ 34,376 | $ 12,618 |