Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Beginning Balance	$ 870,301,000	$ 851,373,000
Acquired goodwill	24,778,000	43,654,000
Goodwill, Impairment Loss	(764,000)		$ (15,564)
Goodwill, Purchase Accounting Adjustments		(2,428,000)
Goodwill, Impairment Loss	(48,524,000)	0	0
Foreign currency translation	(1,032,000)	(22,298,000)
Ending Balance	844,759,000	870,301,000	851,373,000
Reportable Segment [Domain]
Goodwill [Roll Forward]
Beginning Balance	655,039,000	660,793,000
Acquired goodwill	24,778,000	6,253,000
Goodwill, Impairment Loss	0
Goodwill, Purchase Accounting Adjustments		(1,744,000)
Goodwill, Impairment Loss	0
Foreign currency translation	(2,973,000)	(10,263,000)
Ending Balance	676,844,000	655,039,000	660,793,000
All Other Segment [Domain]
Goodwill [Roll Forward]
Beginning Balance	215,262,000	190,580,000
Acquired goodwill	0	37,401,000
Goodwill, Impairment Loss	(764,000)
Goodwill, Purchase Accounting Adjustments		(684,000)
Goodwill, Impairment Loss	(48,524,000)
Foreign currency translation	1,941,000	(12,035,000)
Ending Balance	$ 167,915,000	$ 215,262,000	$ 190,580,000