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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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