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Income Taxes - Components of Income from Continuing Operations Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
US $ (71,626) $ (66,038) $ (41,351)
Foreign 25,833 19,415 6,796
Loss from continuing operations before income taxes $ (45,793) $ (46,623) $ (34,555)