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Statements of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2009 $ 95,516 $ 22,827 $ 8,031 $ 115,187 $ (30,167) $ (20,362)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 28,255     28,255    
Pension liability, net of deferred taxes 714         714
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 shares of common stock (5,718)       (5,718)  
Balance at Dec. 31, 2010 114,480 23,003 9,885 137,125 (35,885) (19,648)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 40,015     40,015    
Pension liability, net of deferred taxes (7,895)         (7,895)
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 shares of common stock (1,999)       (1,999)  
Balance at Dec. 31, 2011 137,391 23,383 10,454 168,981 (37,884) (27,543)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 70,629     70,629    
Pension liability, net of deferred taxes (2,077)         (2,077)
Dividends paid (111,523)     (111,523)    
Stock-based compensation 4,718   4,718      
Exercise of stock options and vesting of RSU's (2,935)   (2,935)      
Tax benefit realized from exercise of stock options and vesting of RSU's 3,474   3,474      
Common stock issued - compensation plans    180 (180)      
Unpaid dividends accrued (4,645)     (4,645)    
Balance at Dec. 31, 2012 $ 95,032 $ 23,563 $ 15,531 $ 123,442 $ (37,884) $ (29,620)