Organization, Basis of Presentation, and Significant Accounting Policies - Schedule of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 1,256,257	$ 1,160,272	$ 1,074,667
Net cash used in investing activities	(965,381)	(1,032,352)	(1,199,517)
Net cash used in financing activities	(418,947)	(303,271)	25,093
Net decrease in cash, cash equivalents and restricted cash	(128,071)	(175,351)	(99,757)
Cash, cash equivalents, beginning of period	214,994	400,507
Cash and cash equivalents and restricted cash, beginning of year	329,977	505,328	605,085
Cash, cash equivalents, end of period	67,088	214,994	400,507
Cash and cash equivalents and restricted cash, end of year	201,906	329,977	505,328
Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		1,143,484	1,056,754
Net cash used in investing activities		(1,037,352)	(1,199,517)
Net cash used in financing activities		(291,645)	33,810
Net decrease in cash, cash equivalents		(185,513)	(108,953)
Cash, cash equivalents, beginning of period	214,994	400,507	509,460
Cash, cash equivalents, end of period		214,994	400,507
Impact of ASU 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		8,562	6,076
Net cash used in financing activities		(8,562)	(6,076)
Impact of ASU 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		8,226	11,837
Net cash used in investing activities		5,000	0
Net cash used in financing activities		(3,064)	(2,641)
Net decrease in cash, cash equivalents		185,513	108,953
Net decrease in cash, cash equivalents and restricted cash		(175,351)	(99,757)
Cash, cash equivalents, beginning of period		(400,507)	(509,460)
Cash and cash equivalents and restricted cash, beginning of year	$ 114,983	104,821	605,085
Cash, cash equivalents, end of period			(400,507)
Cash and cash equivalents and restricted cash, end of year		$ 114,983	$ 104,821