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Summary of Significant Accounting Policies (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of earnings (loss) per basic and diluted weighted average common shares outstanding                      
Net income (loss) $ 4,510 $ 3,396 $ 3,604 $ 4,734 $ 1,467 $ 3,284 $ 4,977 $ 2,932 $ 16,244 $ 12,660 $ (5,440)
Basic weighted-average common shares outstanding                 9,377 9,333 9,278
Effect of potentially dilutive common shares (1)                 68 51  
Diluted weighted-average common shares outstanding                 9,445 9,384 9,278
Earnings (loss) per common share:                      
Earnings (loss) per basic common share $ 0.48 $ 0.36 $ 0.38 $ 0.51 $ 0.16 $ 0.35 $ 0.53 $ 0.32 $ 1.73 $ 1.36 $ (0.59)
Earnings (loss) per diluted common share $ 0.48 $ 0.36 $ 0.38 $ 0.50 $ 0.15 $ 0.35 $ 0.53 $ 0.31 $ 1.72 $ 1.35 $ (0.59)
Antidilutive shares excluded from net earnings per diluted common share calculation                 92 58 47