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Income Taxes (Schedule of Loss Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ (17,848) $ (98) $ (11,783)
Foreign 9,634 (29,378) (74,576)
Loss before income taxes $ (8,214) $ (29,476) $ (86,359)