The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Intangible Assets, Net - Summary (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Intangible assets
Gross Value	$ 325,931		$ 325,931		$ 319,796
Accumulated Amortization	(112,457)		(112,457)		(94,343)
Net Carrying Value	213,474		213,474		$ 225,453
Amortization expense for intangible assets	9,000	$ 9,000	$ 17,900	$ 17,700
Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			11 years 4 months 24 days		12 years 4 months 24 days
Client relationships
Intangible assets
Gross Value	235,906		$ 235,906		$ 237,182
Accumulated Amortization	(72,523)		(72,523)		(60,647)
Net Carrying Value	163,383		$ 163,383		$ 176,535
Client relationships \| Minimum
Intangible assets
Useful life			2 years		2 years
Client relationships \| Maximum
Intangible assets
Useful life			20 years		20 years
Client relationships \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			12 years 9 months 18 days		13 years 1 month 6 days
Non-compete agreements
Intangible assets
Gross Value	4,960		$ 4,960		$ 4,958
Accumulated Amortization	(4,508)		(4,508)		(4,260)
Net Carrying Value	452		$ 452		$ 698
Non-compete agreements \| Minimum
Intangible assets
Useful life			1 year 6 months		1 year 6 months
Non-compete agreements \| Maximum
Intangible assets
Useful life			5 years		5 years
Non-compete agreements \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			10 months 24 days		1 year 4 months 24 days
Trademarks
Intangible assets
Gross Value	42,319		$ 42,319		$ 42,606
Accumulated Amortization	(8,524)		(8,524)		(7,143)
Net Carrying Value	33,795		$ 33,795		$ 35,463
Trademarks \| Minimum
Intangible assets
Useful life			3 years		3 years
Trademarks \| Maximum
Intangible assets
Useful life			15 years		15 years
Trademarks \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			12 years 2 months 12 days		12 years 10 months 24 days
Patents
Intangible assets
Gross Value	200		$ 200		$ 200
Accumulated Amortization	(200)		(200)		(200)
Net Carrying Value	0		$ 0		$ 0
Useful life			3 years		3 years
Patents \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			0 years		0 years
Internal-use software and other
Intangible assets
Gross Value	42,546		$ 42,546		$ 34,850
Accumulated Amortization	(26,702)		(26,702)		(22,093)
Net Carrying Value	$ 15,844		$ 15,844		$ 12,757
Internal-use software and other \| Minimum
Intangible assets
Useful life			3 years		3 years
Internal-use software and other \| Maximum
Intangible assets
Useful life			5 years		5 years
Internal-use software and other \| Weighted Average
Intangible assets
Weighted Average Remaining Useful Life			2 years 7 months 6 days		2 years 3 months 18 days