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Income Taxes (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Maximum
Dec. 31, 2010
Maximum
Reconciliation of the beginning and ending liabilities for unrecognized tax benefits        
Balance at beginning of period $ 567,000 $ 392,000    
Gross increases in current period tax positions 186,000 194,000    
Gross increases in prior period tax positions 134,000 31,000    
Gross decreases in prior period tax positions (232,000) (34,000)    
Lapse of applicable statutes of limitations   (16,000)    
Balance at end of period 655,000 567,000    
Accrued interest and penalties at end of period 185,000 113,000    
Total liability for unrecognized tax benefits 840,000 680,000    
Unrecognized tax benefits        
Interest and penalties charged to income tax expense as a result of the unrecognized tax benefits $ 200,000   $ 100,000 $ 100,000