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Real Estate - Properties Held For Sale (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) property | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Impairment charges | $ 10,600 | $ 3,800 | $ 14,455 | $ 0 | $ 5,000 |
Mortgage loans on real estate | $ 153,829 |  | $ 153,829 | $ 276,163 | 147,188 | $ 102,286
Fund II |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Number of properties held-for-sale | property | 1 |  | 1 | 1 |  |
Properties held-for-sale | $ 25,400 |  | $ 25,400 | $ 21,500 |  |
Mortgage loans on real estate |  |  |  | 25,500 |  |
Disposal group, held-for-sale |  |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |  |
Impairment charges |  |  | 10,600 |  |  |
Properties held for sale net loss |  |  | $ 12,000 | $ 800 | $ 0 |

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