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Income Taxes (Details 2) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Income Taxes      
Alternative minimum tax credit carryforwards $ 4,563,000   $ 5,909,000
Federal and state net operating loss carryforwards     232,000,000
Tax benefit of net operating loss carryforwards      
Net operating loss expiration amount 39,271,000   75,223,000
Reconciliation of beginning and ending amounts of unrecognized tax benefits related to uncertain tax positions      
Balance at the beginning of the period 1,983,000 8,577,000  
Increases related to prior year tax positions   686,000  
Decreases related to prior year tax positions (367,000)    
Settlements with taxing authority (490,000) (1,133,000)  
Effect of the expiration of statutes of limitation (1,126,000) (6,147,000)  
Balance at the end of the period   1,983,000  
Interest and penalties relating to unrecognized tax benefits      
Interest and penalties   300,000  
Offset to interest expense $ 600,000 $ 1,400,000