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Real Estate - Schedule of Real Estate Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | May 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Real Estate Properties [Line Items] |  |  |
Land, at cost | $ 307,384 |  | $ 470,339
Buildings and improvements, at cost | 1,449,140 |  | 1,605,994
Less: accumulated depreciation | (226,408) |  | (305,314)
Real estate, net | 1,530,116 |  | 1,771,019
Real estate available and held for sale | 12,688 |  | 22,551
Total real estate | 1,542,804 |  | 1,793,570
Net investment in leases | 421,252 | $ 424,100 |
Real estate assets derecognized at inception of sales-type lease |  | $ 193,400 |
Net Lease |  |  |
Real Estate Properties [Line Items] |  |  |
Land, at cost | 201,197 |  | 336,740
Buildings and improvements, at cost | 1,342,319 |  | 1,487,270
Less: accumulated depreciation | (213,618) |  | (287,516)
Real estate, net | 1,329,898 |  | 1,536,494
Real estate available and held for sale | 0 |  | 1,055
Total real estate | 1,329,898 |  | 1,537,549
Operating Properties |  |  |
Real Estate Properties [Line Items] |  |  |
Land, at cost | 106,187 |  | 133,599
Buildings and improvements, at cost | 106,821 |  | 118,724
Less: accumulated depreciation | (12,790) |  | (17,798)
Real estate, net | 200,218 |  | 234,525
Real estate available and held for sale | 12,688 |  | 21,496
Total real estate | 212,906 |  | 256,021
Residential Condominiums |  |  |
Real Estate Properties [Line Items] |  |  |
Real estate available and held for sale | $ 11,700 |  | $ 20,600

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