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Goodwill and Other Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	$ 177,682	$ 177,497
Accumulated amortization	(115,858)	(107,595)
Accumulated Impairment Losses	(10,828)	(4,015)
Intangible Assets, Net (Excluding Goodwill), Total	50,996	65,887
Licenses
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	26,214	26,186
Accumulated Impairment Losses	(6,800)	0
Intangible Assets, Net (Excluding Goodwill), Total	19,414	26,186
Customer relationships and customer lists
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items]
Gross  Carrying   Value	108,798	108,641
Accumulated amortization	(76,118)	(67,879)
Accumulated Impairment Losses	(1,403)	(1,390)
Intangible Assets, Net (Excluding Goodwill), Total	31,277	39,372
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
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	(1,405)	(1,381)
Accumulated Impairment Losses	0	0
Intangible Assets, Net (Excluding Goodwill), Total	$ 305	$ 329

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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