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Income Taxes - Other Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 $ 3,100,000   $ 900,000
Provision for undistributed earnings of our foreign subsidiaries $ 0    
State Administration of Taxation, China [Member]      
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 $ 600,000 $ 700,000 $ 200,000