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Variable Interest Entities - Balance Sheet disclosures (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Buildings and improvements | $ 10,877,248 | $ 11,239,732 |
Developments in process | 537,643 | 447,976 |
Land | 1,637,506 | 1,785,865 |
Accumulated depreciation | (2,842,947) | (2,741,695) |
Net real estate | 10,209,450 | 10,731,878 |
Investments in and advances to unconsolidated joint ventures | 540,088 | 800,840 |
Accounts receivable, net | 48,171 | 40,733 |
Cash and cash equivalents | 110,790 | 55,306 |
Restricted cash | 29,056 | 26,897 |
Intangible assets, net | 305,079 | 410,082 |
Other assets, net | 591,017 | 578,033 |
Total assets | 12,718,553 | 14,088,461 | $ 15,759,265
Mortgage debt | 138,470 | 144,486 |
Intangible liabilities, net | 54,663 | 52,579 |
Accounts payable and accrued expenses | 1,125 | 14,031 |
Deferred revenue | 190,683 | 144,709 |
Total liabilities | 6,205,962 | 8,493,523 |
Variable Interest Entity |  |  |
Variable Interest Entity [Line Items] |  |  |
Buildings and improvements | 1,949,582 | 2,436,414 |
Developments in process | 39,584 | 32,285 |
Land | 151,746 | 227,162 |
Accumulated depreciation | (398,143) | (542,091) |
Net real estate | 1,742,769 | 2,153,770 |
Investments in and advances to unconsolidated joint ventures | 1,550 | 2,231 |
Accounts receivable, net | 7,904 | 10,242 |
Cash and cash equivalents | 23,772 | 15,861 |
Restricted cash | 3,399 | 2,619 |
Intangible assets, net | 111,333 | 125,475 |
Other assets, net | 43,149 | 33,749 |
Total assets | 1,933,876 | 2,343,947 |
Mortgage debt | 44,598 | 45,016 |
Intangible liabilities, net | 19,128 | 10,672 |
Accounts payable and accrued expenses | 66,736 | 269,280 |
Deferred revenue | 24,215 | 14,432 |
Total liabilities | $ 154,677 | $ 339,400 |

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