Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Schedule of Loss Before Income Taxes) (Details)

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Income Taxes (Schedule of Loss Before Income Taxes) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ (98) $ (11,783) $ (635,721)
Foreign (29,378) (74,576) (748,110)
Loss before income taxes $ (29,476) $ (86,359) $ (1,383,831)