Investments - Summary of Owned Real Estate Activity (Footnote) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
Dec. 31, 2019 |
|
| Real Estate [Line Items] | |||||
| Revenue producing capitalized expenditures | $ 7,600 | ||||
| Capitalized maintenance expenditures | 2,400 | ||||
| Impairments on owned real estate | $ 21,272 | $ 3,607 | 61,436 | $ 7,299 | |
| Allowance for credit losses on direct financing leases | 0 | $ 0 | 304 | $ 0 | |
| Operating lease held in use land and buildings, net | 5,102,347 | 5,102,347 | |||
| Intangible lease assets, net | 350,466 | 350,466 | $ 385,079 | ||
| Real estate assets under direct financing leases, net | 7,300 | 7,300 | 14,465 | ||
| Real estate assets held for sale, net | 12,708 | 12,708 | 1,144 | ||
| Intangible lease liabilities, net | (120,934) | (120,934) | $ (127,335) | ||
| Net balance | $ 5,351,887 | 5,351,887 | |||
| Held-in-use | |||||
| Real Estate [Line Items] | |||||
| Gain on disposal of assets for properties | 1,100 | ||||
| Held-for-sale | |||||
| Real Estate [Line Items] | |||||
| Gain on disposal of assets for properties | $ 100 | ||||