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Goodwill and Other Intangible Assets Schedule of Finite-Lived Intangible Assets, Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Amortization of Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 4,930 | $ 5,140 | $ 14,920 | $ 15,330
Cost of Sales [Member] | Technology and Other [Member] |  |  |  |
Amortization of Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | 1,280 | 1,460 | 3,990 | 4,230
Selling, General and Administrative Expenses [Member] | Customer Relationships [Member] |  |  |  |
Amortization of Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets | $ 3,650 | $ 3,680 | $ 10,930 | $ 11,100

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- Definition Amortization of finite-lived intangible assets. + References No definition available. + 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=98514028&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=66006027&loc=d3e16323-109275 + Details
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