Summary of Significant Accounting Policies - Balance Sheet Adoption Effect (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid expenses and other current assets, net	$ 102,949			$ 106,189
Property, plant and equipment and leasehold intangibles, net	5,185,681			5,275,427
Operating lease right-of-use assets	1,221,578			0
Investment in unconsolidated ventures	23,211			27,528
Other intangible assets, net	42,776			51,472
Other assets, net	77,663			160,418
Total assets	7,374,203			6,467,260
Refundable fees and deferred revenue	81,034			62,494
Total lease obligations	1,508,393
Deferred liabilities	7,066			262,761
Other liabilities	154,885			197,289
Total liabilities	6,580,407			5,448,847
Total equity	793,796	$ 866,204		1,018,413	$ 889,848	$ 920,657	$ 1,530,291
Total liabilities and equity	$ 7,374,203			$ 6,467,260
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
Total lease obligations			1,618,000
Deferred liabilities			(257,000)
Other liabilities			(43,000)
Total liabilities			1,361,000
Total equity			(56,000)
Total liabilities and equity			$ 1,305,000