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Goodwill and Other Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | $ 177,507 | $ 159,503
Accumulated amortization and impairment losses | (111,639) | (102,537)
Other intangible assets, net | 65,868 | 56,966
Licenses |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 26,186 | 19,414
Accumulated amortization and impairment losses | 0 | 0
Other intangible assets, net | 26,186 | 19,414
Customer relationships and customer lists |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 108,651 | 97,419
Accumulated amortization and impairment losses | (69,298) | (60,221)
Other intangible assets, net | 39,353 | 37,198
Value of business acquired |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 20,200 | 20,200
Accumulated amortization and impairment losses | (20,200) | (20,200)
Other intangible assets, net | 0 | 0
Software |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 12,230 | 12,230
Accumulated amortization and impairment losses | (12,230) | (12,230)
Other intangible assets, net | 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 and impairment losses | (4,500) | (4,500)
Other intangible assets, net | 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 and impairment losses | (4,030) | (4,030)
Other intangible assets, net | 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 and impairment losses | (1,381) | (1,356)
Other intangible assets, net | $ 329 | $ 354

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