Goodwill and Intangible Assets, net - Intangible Assets, net (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 417,400	$ 305,500
Accumulated Amortization	(159,190)	(125,036)
Total	258,210	180,464
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	390,900	286,900
Accumulated Amortization	(149,163)	(116,923)
Total	241,737	169,977
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,700	1,700
Accumulated Amortization	(1,700)	(1,700)
Total	0	0
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	24,800	16,900
Accumulated Amortization	(8,327)	(6,413)
Total	$ 16,473	$ 10,487