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Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 245,137 | $ 214,810
Accumulated Amortization | 68,093 | 59,270
Total intangible Assets, Gross Carrying Amount | 249,711 | 219,548
Net Carrying Amount | 177,044 | 155,540
Indefinite-lived other intangible asset | 4,574 | 4,738
Total intangible assets, Net Carrying Amount | 181,618 | 160,278
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 149,933 | 128,907
Accumulated Amortization | 27,985 | 22,514
Net Carrying Amount | 121,948 | 106,393
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 81,840 | 73,891
Accumulated Amortization | 36,974 | 33,491
Net Carrying Amount | 44,866 | 40,400
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 12,024 | 10,213
Accumulated Amortization | 2,934 | 2,157
Net Carrying Amount | 9,090 | 8,056
Covenants not to compete |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,340 | 1,799
Accumulated Amortization | 200 | 1,108
Net Carrying Amount | $ 1,140 | $ 691

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