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Income Taxes (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]        
Net operating loss carryforward $ 107,000,000      
Tax credit carryforward 2,100,000      
Valuation allowance increase 3,400,000      
Net deferred tax assets 124,576,000 177,803,000    
Current taxes payable 11,900,000      
Current tax receivable   10,000,000    
Unrecognized tax benefits 1,750,000 3,091,000 3,138,000 2,046,000
Unrecognized tax benefits, accrued interest and penalties $ 1,000,000 $ 1,000,000