Intangible Assets, Goodwill and Other Assets (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Finite lived intangible assets
Gross Carrying Amount	$ 313,119		$ 313,119		$ 310,589
Accumulated Amortization	(145,626)		(145,626)		(119,949)
Net Carrying Amount	167,493		167,493		190,640
Amortization expense	8,000	$ 9,000	26,000	$ 27,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	268,195		268,195		265,665
Accumulated Amortization	(108,338)		(108,338)		(88,550)
Net Carrying Amount	159,857		159,857		177,115
Software & technology
Finite lived intangible assets
Gross Carrying Amount	31,600		31,600		31,600
Accumulated Amortization	(23,969)		(23,969)		(19,999)
Net Carrying Amount	7,631		7,631		11,601
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	13,324		13,324		13,324
Accumulated Amortization	(13,319)		(13,319)		(11,400)
Net Carrying Amount	$ 5		$ 5		$ 1,924

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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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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