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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Jan. 01, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Financing arrangement obligation | $ 273,900 |  | $ 378,485 |  |
Accumulated deficit | (1,944,012) |  | (1,614,357) |  |
Cumulative effect of adoption |  | $ (2,203) |  | $ (424,859) | $ 6,484
Right-of-use assets, net | 148,087 |  |  |  |
Total lease liabilities | 100,405 |  |  |  |
Deferred charges and other assets, net | (277,866) |  | (390,403) |  |
Accounts payable and accrued expenses | 51,027 |  | 59,392 |  |
Other accrued liabilities | 265,595 |  | $ 303,051 |  |
Total lease liabilities | $ 13,796 |  |  |  |
Freehold Raceway Mall and Chandler Fashion Center | Joint venture |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Investments in unconsolidated joint ventures |  |  |  | 31,150 |
ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of adoption |  | (2,203) |  |  |
Right-of-use assets, net |  | 109,299 |  |  |
Total lease liabilities |  | 109,299 |  |  |
Deferred charges and other assets, net |  | 59,736 |  |  |
Accounts payable and accrued expenses |  | (5,978) |  |  |
Other accrued liabilities |  | (4,342) |  |  |
Total lease liabilities |  | $ 15,268 |  |  |
ASU 2014-09 | Joint venture | Financing arrangement | Difference between revenue guidance in effect before and after topic 606 | Freehold Raceway Mall and Chandler Fashion Center |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Financing arrangement obligation |  |  |  | 393,709 |
Accumulated deficit |  |  |  | $ 424,859 |

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