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