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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive (Loss) Income
Beginning Balance at Dec. 31, 2010 $ 468,349 $ 2 $ 310,820 $ 255,879    $ (98,352)
Shares, Outstanding at Dec. 31, 2010   22,958         
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 39,674       39,674      
Performance share and restricted stock unit awards (in shares)   144         
Performance share and restricted stock unit awards 5,144    5,144         
Pension and OPEB, net of tax of $(137) in 2012, $(11,406) in 2011, and $15,223 in 2010 (15,810)             (15,810)
Amortization of deferred taxes related to actuarial gain on other postretirement employee benefit obligations (229)             (229)
Foreign currency translation adjustment (874) 0 0 0 0 (874)
Purchase of treasury stock (in shares)         (333)  
Purchase of treasury stock (11,350)          (11,350)   
Ending Balance at Dec. 31, 2011 484,904 2 315,964 295,553 (11,350) (115,265)
Shares, Outstanding at Dec. 31, 2011   23,102     (333)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 64,131       64,131      
Performance share and restricted stock unit awards (in shares)   739         
Performance share and restricted stock unit awards 10,937    10,937         
Pension and OPEB, net of tax of $(137) in 2012, $(11,406) in 2011, and $15,223 in 2010 (208)             (208)
Amortization of deferred taxes related to actuarial gain on other postretirement employee benefit obligations (220)             (220)
Foreign currency translation adjustment 0          
Purchase of treasury stock (in shares)         (520)  
Purchase of treasury stock (18,650)          (18,650)   
Ending Balance at Dec. 31, 2012 540,894 2 326,901 359,684 (30,000) (115,693)
Shares, Outstanding at Dec. 31, 2012   23,841     (853)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net earnings 106,955       106,955      
Performance share and restricted stock unit awards (in shares)   167        
Performance share and restricted stock unit awards (355)    (355)       0
Pension and OPEB, net of tax of $(137) in 2012, $(11,406) in 2011, and $15,223 in 2010 (57,600) 0       0 57,600
Amortization of deferred taxes related to actuarial gain on other postretirement employee benefit obligations 0          
Foreign currency translation adjustment 0          
Purchase of treasury stock (in shares)         (2,071)  
Purchase of treasury stock (100,000) 0       (100,000)   
Ending Balance at Dec. 31, 2013 $ 605,094 $ 2 $ 326,546 $ 466,639 $ (130,000) $ (58,093)
Shares, Outstanding at Dec. 31, 2013   24,008     (2,924)