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Segment Information - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment information |  |  |  |  |  |
Number of reportable segments (segment) | segment |  |  |  | 2 |  |
Total revenues |  | $ 301,116 | $ 398,150 | $ 602,811 | $ 775,531 |
Net income (loss) before equity in net gain on sale of interest in unconsolidated joint venture/real estate, purchase price and other fair value adjustments, (loss) gain on sale of real estate net, depreciable real estate reserves, and gain on sale of marketable securities |  | 47,515 | 35,813 | 94,964 | 87,133 |
Total assets | [1] | 13,713,928 |  | 13,713,928 |  | $ 13,982,904
Marketing, general and administrative |  | 22,479 | 24,256 | 46,007 | 48,399 |
Operating Segments | Real Estate Segment |  |  |  |  |  |
Segment information |  |  |  |  |  |
Total revenues |  | 251,843 | 337,528 | 508,248 | 674,610 |
Net income (loss) before equity in net gain on sale of interest in unconsolidated joint venture/real estate, purchase price and other fair value adjustments, (loss) gain on sale of real estate net, depreciable real estate reserves, and gain on sale of marketable securities |  | 13,239 | (16,232) | 27,263 | (2,425) |
Total assets |  | 11,249,972 |  | 11,249,972 |  | 11,631,700
Operating Segments | Debt and Preferred Equity Segment |  |  |  |  |  |
Segment information |  |  |  |  |  |
Total revenues |  | 49,273 | 60,622 | 94,563 | 100,921 |
Net income (loss) before equity in net gain on sale of interest in unconsolidated joint venture/real estate, purchase price and other fair value adjustments, (loss) gain on sale of real estate net, depreciable real estate reserves, and gain on sale of marketable securities |  | 34,276 | $ 52,045 | 67,701 | $ 89,558 |
Total assets |  | $ 2,463,956 |  | $ 2,463,956 |  | $ 2,351,204
[1] | The Company's consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs"). See Note 2. The consolidated balance sheets include the following amounts related to our consolidated VIEs, excluding the Operating Partnership: $175.0 million and $398.0 million of land, $0.3 billion and $1.4 billion of building and improvements, $2.0 million and $2.0 million of building and leasehold improvements, $47.4 million and $47.4 million of properties under capital lease, $32.2 million and $330.9 million of accumulated depreciation, $860.2 million and $221.0 million of other assets included in other line items, $136.2 million and $628.9 million of real estate debt, net, $0.4 million and $2.5 million of accrued interest payable, $43.2 million and $42.8 million of capital lease obligations, and $155.6 million and $56.8 million of other liabilities included in other line items as of June 30, 2018 and December 31, 2017, respectively.

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