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Employee Benefits And Stock-Based Compensation Employee Benefits and Stock-Based Compensation (Classification of Share-based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Compensation | $ 52,907 | $ 50,044 | $ 46,075
Cost of Sales [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Compensation | 7,030 | 7,253 | 7,009
Selling and Marketing Expense [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Compensation | 5,688 | 5,738 | 6,763
Research and Development Expense [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Compensation | 6,113 | 6,739 | 6,488
General and Administrative Expense [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Share-based Compensation | $ 34,076 | $ 30,314 | $ 25,815

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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