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Goodwill and Other Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	$ 175,191	$ 177,682
Accumulated amortization	(123,071)	(115,858)
Accumulated Impairment Losses	(10,828)	(10,828)
Intangible Assets, Net (Excluding Goodwill), Total	41,292	50,996
Licenses
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	23,779	26,214
Accumulated Impairment Losses	(6,800)	(6,800)
Intangible Assets, Net (Excluding Goodwill), Total	16,979	19,414
Customer relationships and customer lists
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	108,742	108,798
Accumulated amortization	(83,307)	(76,118)
Accumulated Impairment Losses	(1,403)	(1,403)
Intangible Assets, Net (Excluding Goodwill), Total	24,032	31,277
Value of business acquired
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	20,200	20,200
Accumulated amortization	(20,200)	(20,200)
Accumulated Impairment Losses	0	0
Intangible Assets, Net (Excluding Goodwill), Total	0	0
Software
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	12,230	12,230
Accumulated amortization	(12,230)	(12,230)
Accumulated Impairment Losses	0	0
Intangible Assets, Net (Excluding Goodwill), Total	0	0
Patents and intellectual property
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	4,500	4,500
Accumulated amortization	(1,875)	(1,875)
Accumulated Impairment Losses	(2,625)	(2,625)
Intangible Assets, Net (Excluding Goodwill), Total	0	0
Covenants not-to-compete
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	4,030	4,030
Accumulated amortization	(4,030)	(4,030)
Accumulated Impairment Losses	0	0
Intangible Assets, Net (Excluding Goodwill), Total	0	0
Trademarks and trade names
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	1,710	1,710
Accumulated amortization	(1,429)	(1,405)
Accumulated Impairment Losses	0	0
Intangible Assets, Net (Excluding Goodwill), Total	$ 281	$ 305

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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