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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 211,199 | $ 214,810
Accumulated Amortization | 63,789 | 59,270
Total intangible Assets, Gross Carrying Amount | 215,798 | 219,548
Net Carrying Amount | 147,410 | 155,540
Indefinite-lived other intangible asset | 4,599 | 4,738
Total intangible assets, Net Carrying Amount | 152,009 | 160,278
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 127,885 | 128,907
Accumulated Amortization | 25,815 | 22,514
Net Carrying Amount | 102,070 | 106,393
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 72,374 | 73,891
Accumulated Amortization | 35,175 | 33,491
Net Carrying Amount | 37,199 | 40,400
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,180 | 10,213
Accumulated Amortization | 2,649 | 2,157
Net Carrying Amount | 7,531 | 8,056
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 760 | 1,799
Accumulated Amortization | 150 | 1,108
Net Carrying Amount | $ 610 | $ 691

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