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Income Tax (Income Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Deferred Federal Income Tax Expense (Benefit) $ (15,373) $ (20,147) $ 35,522  
Deferred Income Tax Expense (Benefit), Total (15,373) (20,147) 35,522 2
Income Tax Expense (Benefit), Total (15,373) (20,147) 35,522  
Canada [Member]
        
Deferred Foreign Income Tax Expense (Benefit)           
Other Foreign [Member]
        
Deferred Foreign Income Tax Expense (Benefit)