Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Costs related to shareholder activism	$ 0	$ 0	$ 0	$ 19,369
Cumulative effect adjustment					$ (2,203)		$ (424,859)
ROU assets	150,656		150,656
Lease liabilities	102,887		102,887
Deferred charges and other assets, net	(277,799)		(277,799)			$ (390,403)
Accounts payable and accrued expenses	61,348		61,348			59,392
Other accrued liabilities	253,882		253,882			$ 303,051
Finance lease liabilities	$ 13,796		$ 13,796
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment					(2,203)
ROU assets					109,299
Lease liabilities					109,299
Deferred charges and other assets, net					59,736
Accounts payable and accrued expenses					(5,978)
Other accrued liabilities					(4,342)
Finance lease liabilities					$ 15,268