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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jan. 01, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
(Benefit from) provision for income taxes | $ 3,068 | $ 3,221 | $ (8,586) | $ 8,417 |  |
Effective income tax rate | 26.60% | 39.20% | (29.60%) | 38.70% |  |
Benefit recognized for excess tax benefits related to stock-based compensation | $ 1,300 |  | $ 19,500 |  |  |
Unrecognized tax benefits | 4,500 |  | 4,500 |  |  | $ 4,100
Unrecognized tax benefits that would impact effective tax rate | $ 2,600 |  | $ 2,600 |  |  | 2,400
ASU 2016-09 |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Decrease to deferred tax assets |  |  |  |  | $ (7,900) |
ASU 2016-09 | Retained Earnings |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ (500) | $ 8,400

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- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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