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Goodwill Goodwill and Intangible Assets - Intangible Assets (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Years | Dec. 31, 2014 USD ($)
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount | $ 593,037 | $ 613,390 |  |
Accumulated amortization | (256,155) | (224,064) |  |
Intangible assets, net | 336,882 | 389,326 |  |
Impairment of Intangible Assets (Excluding Goodwill) |  |  |  | $ 78,000
Amortization of Intangible Assets | 54,886 | $ 51,036 |  | $ 44,063
Future Amortization Expense, Year One | 49,386 |  |  |
Future Amortization Expense, Year Two | 43,245 |  |  |
Future Amortization Expense, Year Three | 36,929 |  |  |
Future Amortization Expense, Year Four | 29,973 |  |  |
Future Amortization Expense, Year Five | $ 21,724 |  |  |
Customer Relationships [Member] |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Useful Life | 10 years | 10 years |  |
Gross carrying amount | $ 476,176 | $ 498,319 |  |
Accumulated amortization | (247,206) | (215,263) |  |
Intangible assets, net | $ 228,970 | $ 283,056 |  |
Patented Technology [Member] |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Weighted Average Useful Life | 5 years | 5 years |  |
Gross carrying amount | $ 9,140 | $ 13,154 |  |
Accumulated amortization | (4,435) | (7,894) |  |
Intangible assets, net | 4,705 | 5,260 |  |
Other Intangible Assets [Member] |  |  |  |
Finite And Indefinite Lived Intangible Assets [Line Items] |  |  |  |
Gross carrying amount | 6,721 | 917 | [1] |
Accumulated amortization | (4,514) | (907) | [1] |
Intangible assets, net | 2,207 | $ 10 | [1] |
Acquired Finite-lived Intangible Asset, Useful Life, Minimum | Years |  | 2 |  |
Acquired Finite-lived Intangible Asset, Useful Life, Maximum | Years |  | 3 |  |
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 three 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=26713463&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + 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 second 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=26713463&loc=d3e16323-109275 + Details
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