Goodwill and Other Intangible Assets - Intangible Assets, Net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 394,532	$ 364,502
Accumulated Amortization	91,584	81,775
Net Carrying Amount	302,948	282,727
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	307,854	283,005
Accumulated Amortization	61,530	53,984
Net Carrying Amount	$ 246,324	$ 229,021
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	1 year	1 year
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years	10 years
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,953	$ 8,827
Accumulated Amortization	4,042	3,884
Net Carrying Amount	$ 4,911	$ 4,943
Trade name | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	1 year 6 months	1 year 6 months
Trade name | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	10 years	10 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 76,577	$ 71,522
Accumulated Amortization	25,342	23,333
Net Carrying Amount	$ 51,235	$ 48,189
Developed technology | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	4 years	4 years
Developed technology | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	9 years	9 years
Noncompete agreements
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		3 years
Gross Carrying Amount	$ 1,148	$ 1,148
Accumulated Amortization	670	574
Net Carrying Amount	$ 478	$ 574