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Summary of Significant Accounting Policies - Balance Sheet Adoption Effect (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Prepaid expenses and other current assets, net | $ 66,937 | $ 84,241 |  |  |
Property, plant and equipment and leasehold intangibles, net | 5,068,060 | 5,109,834 |  |  |
Operating lease right-of-use assets | 788,138 | 1,159,738 |  |  |
Investment in unconsolidated ventures | 4,898 | 21,210 |  |  |
Other assets, net | 56,259 | 118,731 |  |  |
Total assets | 6,901,758 | 7,194,433 |  |  |
Refundable fees and deferred revenue | 96,995 | 79,402 |  |  |
Operating lease obligations | 965,655 |  |  |  |
Other liabilities | 188,443 | 169,017 |  |  |
Total liabilities | 6,099,029 | 6,495,708 |  |  |
Total equity | 802,729 | 698,725 |  | $ 1,018,413 | $ 1,530,291
Total liabilities and equity | $ 6,901,758 | $ 7,194,433 |  |  |
ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Prepaid expenses and other current assets, net |  |  | $ 67,000 |  |
Property, plant and equipment and leasehold intangibles, net |  |  | (11,000) |  |
Operating lease right-of-use assets |  |  | 1,329,000 |  |
Investment in unconsolidated ventures |  |  | (2,000) |  |
Other intangible assets, net |  |  | (5,000) |  |
Other assets, net |  |  | (73,000) |  |
Total assets |  |  | 1,305,000 |  |
Refundable fees and deferred revenue |  |  | 43,000 |  |
Operating lease obligations |  |  | 1,618,000 | $ 231,400 |
Deferred liabilities |  |  | (257,000) |  |
Other liabilities |  |  | (43,000) |  |
Total liabilities |  |  | 1,361,000 |  |
Total equity |  |  | (56,000) |  |
Total liabilities and equity |  |  | $ 1,305,000 |  |

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