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Earnings (Loss) Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Net Income (Loss) Attributable to Parent:                      
Net Earnings (Loss) $ 11,264 $ 9,728 $ 5,855 $ 5,866 $ 17,012 $ 7,526 $ 6,175 $ 4,091 $ 32,713 $ 34,803 $ (26,241)
Weighted Average Shares Outstanding:                      
Basic (in shares)                 18,832,693 18,805,494 18,507,772
Employee stock options (in shares)                 527,735 526,609 0
Diluted (in shares)                 19,360,428 19,332,103 18,507,772
Net Earnings (Loss) per Share:                      
Basic (in dollars per share) $ 0.60 $ 0.52 $ 0.31 $ 0.31 $ 0.91 $ 0.40 $ 0.33 $ 0.22 $ 1.74 $ 1.85 $ (1.42)
Diluted (in dollars per share) $ 0.59 $ 0.50 $ 0.30 $ 0.30 $ 0.89 $ 0.39 $ 0.32 $ 0.21 $ 1.69 $ 1.80 $ (1.42)
Anti-dilutive securities excluded from earnings per share calculation (in shares)                 123,292 264,447 502,103