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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 216,015 | $ 214,810
Accumulated Amortization | 63,883 | 59,270
Total intangible Assets, Gross Carrying Amount | 220,881 | 219,548
Net Carrying Amount | 152,132 | 155,540
Indefinite-lived other intangible asset | 4,866 | 4,738
Total intangible assets, Net Carrying Amount | 156,998 | 160,278
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 129,330 | 128,907
Accumulated Amortization | 24,675 | 22,514
Net Carrying Amount | 104,655 | 106,393
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 74,671 | 73,891
Accumulated Amortization | 35,645 | 33,491
Net Carrying Amount | 39,026 | 40,400
Trademarks and patents |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,214 | 10,213
Accumulated Amortization | 2,413 | 2,157
Net Carrying Amount | 7,801 | 8,056
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,800 | 1,799
Accumulated Amortization | 1,150 | 1,108
Net Carrying Amount | $ 650 | $ 691

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + 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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