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Consolidated Statements Of Shareholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Common Stock And Paid In Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Retained Earnings [Member]
Total
Balance, value at Dec. 31, 2008 $ 115 $ (95,750) $ 386,758 $ 291,123
Balance, shares at Dec. 31, 2008 15,199,207      
Comprehensive income:        
Net income     162,283 162,283
Changes in (net of tax):        
Foreign currency translation adjustments   17,816   17,816
Pension plans and other postretirement benefit adjustments:        
Prior service cost   200   200
Unrecognized actuarial gain/loss   3,304   3,304
Transition obligation   9   9
Derivative net loss   (363)   (363)
Unrealized gain on marketable securities       0
Total comprehensive income       183,249
Cash dividends     (16,347) (16,347)
Stock options exercised, shares 9,000      
Stock options exercised 40     40
Issuance of stock, shares 1,782      
Issuance of stock 120     120
Balance, value at Dec. 31, 2009 275 (74,784) 532,694 458,185
Balance, shares at Dec. 31, 2009 15,209,989      
Comprehensive income:        
Net income     177,125 177,125
Changes in (net of tax):        
Foreign currency translation adjustments   (6,042)   (6,042)
Pension plans and other postretirement benefit adjustments:        
Prior service cost   (523)   (523)
Unrecognized actuarial gain/loss   9,006   9,006
Transition obligation   10   10
Derivative net loss   (1,487)   (1,487)
Unrealized gain on marketable securities       0
Total comprehensive income       178,089
Cash dividends     (22,608) (22,608)
Repurchases of common stock, shares (1,213,158)      
Repurchases of common stock (3,104)   (121,751) (124,855)
Stock options exercised, shares 21,000      
Stock options exercised 91     91
Stock option tax benefit 711     711
Issuance of stock, shares 17,053      
Issuance of stock 2,027     2,027
Balance, value at Dec. 31, 2010 0 (73,820) 565,460 491,640
Balance, shares at Dec. 31, 2010 14,034,884     14,034,884
Comprehensive income:        
Net income     206,907 206,907
Changes in (net of tax):        
Foreign currency translation adjustments   163   163
Pension plans and other postretirement benefit adjustments:        
Prior service cost   260   260
Unrecognized actuarial gain/loss   (25,154)   (25,154)
Transition obligation   40   40
Derivative net loss   (585)   (585)
Unrealized gain on marketable securities   364   364
Total comprehensive income       181,995
Cash dividends     (32,588) (32,588)
Repurchases of common stock, shares (659,373)      
Repurchases of common stock (3,237)   (91,518) (94,755)
Stock options exercised, shares 16,000     16,000
Stock options exercised 70     70
Stock option tax benefit 1,102     1,102
Issuance of stock, shares 13,320      
Issuance of stock 2,129     2,129
Balance, value at Dec. 31, 2011 $ 64 $ (98,732) $ 648,261 $ 549,593
Balance, shares at Dec. 31, 2011 13,404,831     13,404,831