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Goodwill and Other Intangible Assets (Schedule of Finite-Lived Intangible Assets by Major Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | $ 148,395 | $ 148,395
Accumulated amortization and impairment losses | (93,924) | (82,937)
Other intangible assets, net | 54,471 | 65,458
Licenses |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 10,267 | 10,267
Accumulated amortization and impairment losses | 0 | 0
Other intangible assets, net | 10,267 | 10,267
Customer relationships and customer lists |  |
Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] |  |
Gross carrying value | 95,458 | 95,458
Accumulated amortization and impairment losses | (51,633) | (42,142)
Other intangible assets, net | 43,825 | 53,316
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) | (19,527)
Other intangible assets, net | 0 | 673
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) | (11,938)
Other intangible assets, net | 0 | 292
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) | (3,523)
Other intangible assets, net | 0 | 507
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 | (1,331) | (1,307)
Other intangible assets, net | $ 379 | $ 403

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- Definition Intangible Assets (Excluding Goodwill), Accumulated Amortization and Impairment + References No definition available. + Details
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- Definition Schedule of Finite and Indefinite-lived Intangible Assets [Line Items] + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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