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Statements of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Total
Balance at Dec. 31, 2008 $ 22,799 $ 2,442 $ 93,500 $ (30,153) $ (22,985) $ 65,603
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income     27,503     27,503
Pension liability, net of deferred taxes of $1,608 for Dec 2009 ,$460 for Dec 2010 and $4,133 for Dec 2011         2,623 2,623
Comprehensive income           30,126
Dividends paid     (5,816)     (5,816)
Stock-based compensation   4,205       4,205
Tax benefit realized from exercise of stock options and vesting of RSU's   1,412       1,412
Common stock issued - compensation plans 28 (28)        
Repurchase of 2,401 shares for Dec 2009 ,412,213 shares for Dec 2010 and 133,400 shares for Dec 2011 of common stock       (14)   (14)
Balance at Dec. 31, 2009 22,827 8,031 115,187 (30,167) (20,362) 95,516
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income     28,255     28,255
Pension liability, net of deferred taxes of $1,608 for Dec 2009 ,$460 for Dec 2010 and $4,133 for Dec 2011         714 714
Comprehensive income           28,969
Dividends paid     (6,317)     (6,317)
Stock-based compensation   2,589       2,589
Exercise of stock options and vesting of RSU's   (1,367)       (1,367)
Tax benefit realized from exercise of stock options and vesting of RSU's   808       808
Common stock issued - compensation plans 176 (176)        
Repurchase of 2,401 shares for Dec 2009 ,412,213 shares for Dec 2010 and 133,400 shares for Dec 2011 of common stock       (5,718)   (5,718)
Balance at Dec. 31, 2010 23,003 9,885 137,125 (35,885) (19,648) 114,480
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income     40,015     40,015
Pension liability, net of deferred taxes of $1,608 for Dec 2009 ,$460 for Dec 2010 and $4,133 for Dec 2011         (7,895) (7,895)
Comprehensive income           32,120
Dividends paid     (8,159)     (8,159)
Stock-based compensation   2,953       2,953
Exercise of stock options and vesting of RSU's   (5,859)       (5,859)
Tax benefit realized from exercise of stock options and vesting of RSU's   3,855       3,855
Common stock issued - compensation plans 380 (380)        
Repurchase of 2,401 shares for Dec 2009 ,412,213 shares for Dec 2010 and 133,400 shares for Dec 2011 of common stock       (1,999)   (1,999)
Balance at Dec. 31, 2011 $ 23,383 $ 10,454 $ 168,981 $ (37,884) $ (27,543) $ 137,391