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Income Taxes - Income Attributable to Domestic and Foreign Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income (loss) before income taxes      
Domestic $ (53,553) $ (95,195) $ (84,942)
Foreign 30,907 16,841 13,732
Income (loss) before income taxes $ (22,646) $ (78,354) $ (71,210)