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Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2010 $ 114,480 $ 23,003 $ 9,885 $ 137,125 $ (35,885) $ (19,648)
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)   
Unpaid dividends accrued                 
Balance at Dec. 31, 2011 137,391 23,383 10,454 168,981 (37,884) (27,543)
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)         
Repurchase shares of common stock                 
Unpaid dividends accrued (4,645)       (4,645)      
Balance at Dec. 31, 2012 95,032 23,563 15,531 123,442 (37,884) (29,620)
Net income 111,272       111,272      
Pension liability, net of deferred taxes 10,240             10,241
Dividends paid (41,079)       (41,079)      
Stock-based compensation 5,288    5,288         
Exercise of stock options and vesting of RSU's (2,423)    (2,423)         
Tax benefit realized from exercise of stock options and vesting of RSU's 2,302    2,302         
Common stock issued - compensation plans    84 (84)         
Repurchase shares of common stock                 
Unpaid dividends accrued (1,547)       (1,547)      
Balance at Dec. 31, 2013 $ 179,086 $ 23,647 $ 20,614 $ 192,088 $ (37,884) $ (19,379)