Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narratives) (Details)

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Income Taxes (Narratives) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Income tax expense $ 1,847,000 $ (10,029,000) $ (10,957,000)
Federal statutory income tax rate 35.00%    
Unrecognized tax benefits $ 0 0 0
Income tax interest expense 0 0 0
Income tax penalties expense 0 $ 0 $ 0
Cumulative excess tax benefits, share based compensation expense, not recognize 3,400,000    
Alternative Minimum Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward, amount 1,700,000    
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 340,471,000