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Note D - Pension And Other Postretirement Benefits (Detail) - Components of Pension Cost (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pension Plans, Defined Benefit [Member]
       
Service cost $ 797 $ 714 $ 2,391 $ 2,142
Interest cost 700 767 2,102 2,301
Expected return on plan assets (1,148) (1,127) (3,443) (3,383)
Recognized actuarial loss (gain) 611 418 1,831 1,256
Net periodic benefit cost 960 772 2,881 2,316
Other Postretirement Benefit Plans, Defined Benefit [Member]
       
Service cost 288 263 866 789
Interest cost 218 277 653 831
Recognized actuarial loss (gain) (161) (164) (485) (492)
Net periodic benefit cost $ 345 $ 376 $ 1,034 $ 1,128