Goodwill And Other Intangible Assets - Changes in carrying amounts of intangible assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-lived Intangible Assets [Roll Forward]
Intangible assets subject to amortization, balance at December 31, 2016	$ 1,025,134
Amortization of intangible assets	(83,764)
Intangible assets subject to amortization, foreign currency translation adjustment	568
Intangible assets subject to amortization, balance at June 30, 2017	941,938
Indefinite-lived Intangible Assets [Roll Forward]
Other intangible assets not subject to amortization	794,000	$ 794,000
Goodwill [Roll Forward]
Goodwill gross balance as of December 31, 2016		3,608,930
Goodwill, accumulated impairment losses as of December 31, 2016		(381,000)
Goodwill, balance at December 31, 2016	3,227,930
Goodwill, foreign currency translation adjustment	655
Goodwill, balance at June 30, 2017	3,228,585
Total goodwill and other intangible assets	$ 4,964,523	$ 5,047,064