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Income Tax (Deferred Tax Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Deferred Income Tax Expense (Benefit) [Abstract]      
Deferred Federal Income Tax Expense (Benefit) $ (20,147) $ 35,522  
Deferred Income Tax Expense (Benefit), subtotal (20,147) 35,522  
Deferred Income Tax Expense (Benefit), Total $ (20,147) $ 35,522 $ 15,375