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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income, Other Expenses, and Change in Accounting Pronouncements (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 30, 2017
Other comprehensive loss:
Stockholders' equity, beginning balance	$ 2,297,438,000
Foreign currency translation adjustments	(160,702,000)	$ 108,584,000	$ (36,922,000)
Market value adjustments for securities			(734,000)
Fair value adjustments for interest rate swap agreements	(973,000)
Total Other comprehensive (loss) income	(161,675,000)	108,584,000	(37,656,000)
Stockholders' equity, ending balance	1,884,180,000	2,297,438,000
Foreign Currency Translation Adjustments
Other comprehensive loss:
Stockholders' equity, beginning balance	(103,989,000)	(212,573,000)	(175,651,000)
Foreign currency translation adjustments	(160,702,000)	108,584,000	(36,922,000)
Market value adjustments for securities			0
Fair value adjustments for interest rate swap agreements	0
Total Other comprehensive (loss) income	(160,702,000)	108,584,000	(36,922,000)
Stockholders' equity, ending balance	(264,691,000)	(103,989,000)	(212,573,000)
Market Value Adjustments for Securities
Other comprehensive loss:
Stockholders' equity, beginning balance	0	0	734,000
Foreign currency translation adjustments	0	0	0
Market value adjustments for securities			(734,000)
Fair value adjustments for interest rate swap agreements	0
Total Other comprehensive (loss) income	0	0	(734,000)
Stockholders' equity, ending balance	0	0	0
Fair Value Adjustments for Interest Rate Swap Agreements
Other comprehensive loss:
Stockholders' equity, beginning balance	0	0	0
Foreign currency translation adjustments	0	0	0
Market value adjustments for securities			0
Fair value adjustments for interest rate swap agreements	(973,000)
Total Other comprehensive (loss) income	(973,000)	0	0
Stockholders' equity, ending balance	(973,000)	0	0
Accumulated Other Comprehensive Items, Net
Other comprehensive loss:
Stockholders' equity, beginning balance	(103,989,000)	(212,573,000)	(174,917,000)
Stockholders' equity, ending balance	$ (265,664,000)	(103,989,000)	$ (212,573,000)
Disposal Group, Not Discontinued Operations | Russia and Ukraine Divestment
Other comprehensive loss:
Cumulative translation adjustment		$ 29,100,000		$ 29,100,000

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