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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator:                      
Net income (loss) $ 10,022 $ 8,315 $ 9,462 $ 6,960 $ 9,771 $ 8,746 $ 9,535 $ 6,210 $ 34,759 $ 34,262 $ 18,298
Less: Net income allocated to participating securities                 (336) (282) (97)
Net income available to common shareholders                 $ 34,423 $ 33,980 $ 18,201
Denominator:                      
Weighted average common shares outstanding                 20,821,000 20,391,000 20,151,000
Weighted average dilutive securities (in shares)                 610,000 781,000 842,000
Weighted average common shares outstanding, diluted                 21,431,000 21,172,000 20,993,000
Earnings per share                      
Income per common share, basic (in dollars per share) $ 0.47 $ 0.39 $ 0.45 $ 0.33 $ 0.47 $ 0.42 $ 0.46 $ 0.30 $ 1.65 $ 1.67 $ 0.90
Income per common share, diluted (in dollars per share) $ 0.46 $ 0.38 $ 0.44 $ 0.32 $ 0.46 $ 0.41 $ 0.45 $ 0.29 $ 1.61 $ 1.60 $ 0.87
Employee stock options
                      
Earnings Per Share                      
Common equivalents excluded from the diluted earnings per share calculation                 219,981 229,128 89,240
Nonvested performance shares
                      
Earnings Per Share                      
Common equivalents excluded from the diluted earnings per share calculation                 0 9,718 51,879