Intangible Assets and Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite lived intangible assets
Gross Carrying Amount	$ 421,189		$ 421,189		$ 414,922
Accumulated Amortization	(221,474)		(221,474)		(201,722)
Net Carrying Amount	199,715		199,715		213,200
Amortization expense	9,000	$ 10,000	27,000	$ 29,000
Customer relationships
Finite lived intangible assets
Gross Carrying Amount	347,515		347,515		338,320
Accumulated Amortization	(164,336)		(164,336)		(149,539)
Net Carrying Amount	183,179		183,179		188,781
Software & technology
Finite lived intangible assets
Gross Carrying Amount	52,309		52,309		54,297
Accumulated Amortization	(38,517)		(38,517)		(35,325)
Net Carrying Amount	13,792		13,792		18,972
Trademarks & other
Finite lived intangible assets
Gross Carrying Amount	21,365		21,365		22,305
Accumulated Amortization	(18,621)		(18,621)		(16,858)
Net Carrying Amount	$ 2,744		$ 2,744		$ 5,447

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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