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Income Taxes - Income Attributable to Domestic and Foreign Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (loss) from continuing operations before income taxes      
Domestic $ (96,809) $ (123,021) $ (53,553)
Foreign 15,909 3,577 30,907
Income (loss) before income taxes $ (80,900) $ (119,444) $ (22,646)