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Income Taxes - Other Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |
Tax benefit from the exercises of non-qualified stock options and vesting of restricted stock under our stock-based incentive plans | $ 2,000,000 | $ 3,100,000 |
Provision for undistributed earnings of our foreign subsidiaries | $ 0 |  |
State Administration of Taxation, China |  |  |
Income Taxes [Line Items] |  |  |
Period of recognition for deductible expenses or deferred tax assets | 5 years |  |
Increase in income tax expense due to write-off of deferred tax assets for social insurance and housing funds | $ 0 | $ 600,000 | $ 700,000

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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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