Intangible Assets and Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Finite lived intangible assets
Gross Carrying Amount	$ 287,188		$ 287,188		$ 287,199
Accumulated Amortization	(142,496)		(142,496)		(127,360)
Net Carrying Amount	144,692		144,692		159,839
Amortization expense	8,000	$ 9,000	15,000	$ 18,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	268,188		268,188		268,199
Accumulated Amortization	(128,247)		(128,247)		(115,010)
Net Carrying Amount	139,941		139,941		153,189
Software & technology
Finite lived intangible assets
Gross Carrying Amount	19,000		19,000		19,000
Accumulated Amortization	(14,249)		(14,249)		(12,350)
Net Carrying Amount	$ 4,751		$ 4,751		$ 6,650

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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