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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of differences between the federal tax rate and the Company's effective tax rate for results of continuing operations      
U.S. tax at statutory rate $ 10,138 $ 11,225 $ 8,570
U.S. tax at statutory rate, percentage 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 1,199 1,116 185
State income taxes, net of federal benefit, percentage 4.20% 3.50% 0.70%
Deductible losses (404)    
Deductible losses, percentage (1.40%) 0.00% 0.00%
Non taxable gain   (1,342)  
Non taxable gain, percentage 0.00% (4.20%) 0.00%
Nondeductible expenses 101 98 85
Nondeductible expenses, percentage 0.30% 0.30% 0.40%
Total income tax provision for continuing operations $ 11,034 $ 11,097 $ 8,840
Total 38.10% 34.60% 36.10%