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Intangible Assets (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Years | Dec. 31, 2015 USD ($)
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | $ 549,916 | $ 593,037 |
Accumulated amortization |  | (263,701) | (256,155) |
Intangible assets, net |  | 286,215 | 336,882 |
Amortization of Intangible Assets |  | 50,071 | $ 54,886 | $ 51,036
Future Amortization Expense, Year One |  | 40,916 |  |
Future Amortization Expense, Year Two |  | 34,497 |  |
Future Amortization Expense, Year Three |  | 28,492 |  |
Future Amortization Expense, Year Four |  | 22,534 |  |
Future Amortization Expense, Year Five |  | $ 20,462 |  |
Customer Relationships [Member] |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Useful Life |  | 10 years | 10 years |
Gross carrying amount |  | $ 440,167 | $ 476,176 |
Accumulated amortization |  | (259,337) | (247,206) |
Intangible assets, net |  | $ 180,830 | $ 228,970 |
Patented Technology [Member] |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Useful Life |  | 5 years | 5 years |
Gross carrying amount |  | $ 6,340 | $ 9,140 |
Accumulated amortization |  | (3,043) | (4,435) |
Intangible assets, net |  | $ 3,297 | 4,705 |
Amortizable trade names [Domain] |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Useful Life |  | 5 years |  |
Gross carrying amount |  | $ 2,409 |  |
Accumulated amortization |  | (1,321) |  |
Intangible assets, net |  | 1,088 |  |
Other Intangible Assets [Member] |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount | [1] |  | 6,721 |
Accumulated amortization | [1] |  | (4,514) |
Intangible assets, net | [1] |  | $ 2,207 |
Acquired Finite-lived Intangible Asset, Useful Life, Minimum | Years |  |  | 2 |
Acquired Finite-lived Intangible Asset, Useful Life, Maximum | Years |  |  | 5 |
Trade Names [Member] |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount |  | 101,000 | $ 101,000 |
Accumulated amortization |  | 0 | 0 |
Intangible assets, net |  | $ 101,000 | $ 101,000 |
[1] | Consists of non-competition agreements with useful lives ranging from two to five years.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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