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Basis of Presentation - Recently Adopted Accounting Standards (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Tax benefit | $ 1,100 |
Cash paid on behalf of employees for shares withheld | $ 5,155 | $ 3,973

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- Definition Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount + References No definition available. + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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