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Summary of Significant Accounting Policies (Other Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	$ 88,293	$ 89,628
Accumulated amortization	(32,899)	(31,506)
Intangible Assets, Net (Excluding Goodwill), Total	55,394	58,122
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	48,339	50,750
Accumulated amortization	(18,530)	(17,466)
Intangible Assets, Net (Excluding Goodwill), Total	29,809	33,284
Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	17,201	20,041
Accumulated amortization	(6,290)	(6,687)
Intangible Assets, Net (Excluding Goodwill), Total	10,911	13,354
Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	13,799	15,231
Accumulated amortization	(8,079)	(7,353)
Intangible Assets, Net (Excluding Goodwill), Total	5,720	7,878
Capitalized Software Development [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition cost	8,954	3,606
Intangible Assets, Net (Excluding Goodwill), Total	$ 8,954	$ 3,606

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-Publisher FASB
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