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Income Taxes (Deferred Tax Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
U.S. [Member]      
Current income tax expense (benefit) $ 0 $ 0 $ 0
Deferred income tax expense (benefit) 0 0 0
Canada [Member]      
Current income tax expense (benefit) 0 0 0
Deferred income tax expense (benefit) 0 0 0
Other Foreign [Member]      
Current income tax expense (benefit) 0 0 0
Deferred income tax expense (benefit) $ 0 $ 0 $ 0