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Income Taxes - Sources of Income Before Provision for Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
United States $ 15,998 $ (2,317) $ (17,823)
Foreign 69,921 45,332 (4,381)
Income (loss) from continuing operations before provision for (benefit from) income taxes $ 85,919 $ 43,015 $ (22,204)