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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
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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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