Investments - Summary of Impairment and Credit Losses Recognized (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
|
| Real Estate [Abstract] | ||||
| Real estate and intangible asset impairment | $ 21,272 | $ 3,607 | $ 61,436 | $ 7,299 |
| Allowance for credit losses on direct financing leases | 0 | 0 | 304 | 0 |
| (Reversal)/allowance for credit losses on loans receivable | (223) | 0 | 83 | 0 |
| Total impairment loss | $ 21,049 | $ 3,607 | $ 61,823 | $ 7,299 |