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Income Taxes (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Taxes [Line Items]      
Excess tax benefits from stock based compensation $ 81,000 $ 932,000 $ 2,665,000
Net excess tax benefits from equity-based compensation recorded in stockholder's equity 81,000 193,000 2,665,000
Unrecognized tax benefit that, if recognized, would favorably affect the effective tax rate 3,800,000    
Total amount of accrued interest and penalties 700,000 200,000  
Decreases in income tax penalties and interest accrued 300,000   200,000
Increases in income tax penalties and interest accrued   100,000  
Decrease in unrecognized tax benefits is reasonably possible, amount of unrecorded decrease 1,000,000    
Domestic Tax Authority [Member]
     
Income Taxes [Line Items]      
Operating loss carryforwards 77,300,000    
Tax credit carryforwards 3,600,000    
Foreign Tax Authority [Member]
     
Income Taxes [Line Items]      
Operating loss carryforwards 3,600,000    
State and Local Jurisdiction [Member]
     
Income Taxes [Line Items]      
Operating loss carryforwards 57,100,000    
Tax credit carryforwards 11,600,000    
Tax credit carryforward, valuation allowance $ 8,500,000