Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 602,330	$ 549,916
Accumulated amortization	229,686	263,701
Intangible assets, net	372,644	286,215
Amortization of Intangible Assets	49,356	50,071	$ 54,886
Future Amortization Expense, Year One	44,336
Future Amortization Expense, Year Two	38,434
Future Amortization Expense, Year Three	32,462
Future Amortization Expense, Year Four	30,180
Future Amortization Expense, Year Five		$ 24,271
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life		10 years	10 years
Gross carrying amount	475,050	$ 440,167
Accumulated amortization	221,822	259,337
Intangible assets, net	253,228	$ 180,830
Patented Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life		5 years	5 years
Gross carrying amount	6,340	$ 6,340
Accumulated amortization	4,311	3,043
Intangible assets, net	2,029	$ 3,297
Amortizable trade names [Domain]
Finite And Indefinite Lived Intangible Assets [Line Items]
Weighted Average Useful Life		5 years
Other Intangible Assets [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	19,940	$ 2,409
Accumulated amortization	(3,553)	1,321
Intangible assets, net	16,387	1,088
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying amount	101,000	101,000
Accumulated amortization	0	0
Intangible assets, net	$ 101,000	$ 101,000