Goodwill and Acquired Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Acquired Intangible Assets Net [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The following table summarizes intangible assets as of December 31, 2019 and 2018:

	As of December 31, 2019					As of December 31, 2018
(in thousands)	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Customer relationships	$	240,027	$	(139,319	)	$	199,581	$	(133,863	)
Trademarks and trade names	45,347		(28,123		)	45,233		(25,837		)
Software	59,244		(35,362		)	58,515		(29,420		)
Non-compete agreements	2,082		(2,049		)	2,076		(1,800		)
Total	$	346,700	$	(204,853	)	$	305,405	$	(190,920	)

Schedule of Intangible Assets and Goodwill [Table Text Block]

The following table summarizes the goodwill and amortizable intangible assets activity for the years ended December 31, 2019 and 2018:

(in thousands)	Acquired Intangible Assets			Goodwill			Total Intangible Assets
Balance as of January 1, 2018	$	150,543		$	717,386		$	867,929
Increases (decreases):
Acquisitions	—			20,742			20,742
Impairment	(7,049		)	—			(7,049		)
Amortization	(22,562		)	—			(22,562		)
Other (primarily changes in foreign currency exchange rates)	(6,447		)	(33,931		)	(40,378		)
Balance as of December 31, 2018	114,485			704,197			818,682
Increases (decreases):
Acquisitions	46,246			35,305			81,551
Impairment	—			—			—
Amortization	(20,374		)	—			(20,374		)
Other (primarily changes in foreign currency exchange rates)	1,490			4,321			5,811
Balance as of December 31, 2019	$	141,847		$	743,823		$	885,670