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Note F - Accumulated Other Comprehensive Income (Loss) (Details) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Settlement loss (b) $ (82,093) $ (76,701) $ (247,427) $ (227,868)
Settlement loss (c) (14,046) (12,448) (40,390) (38,379)
Total before income tax 14,281 11,967 42,341 33,690
Income tax (4,842) (4,021) (14,088) (10,758)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Recognized actuarial loss (gain) (a) 22 [1] 297 [1] 360 [1] 1,080 [1]
Settlement loss (b)    [2] 324 [2]    [2] 2,298 [2]
Settlement loss (c)    [3] 166 [3]    [3] 1,179 [3]
Total before income tax 22 787 360 4,557
Income tax (7) (332) (133) (1,524)
Net of income tax $ 15 $ 455 $ 227 $ 3,033
[1] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note E for additional details.
[2] This portion of the settlement loss is included in Cost of products sold in the Statements of Income.
[3] This portion of the settlement loss in included in Selling, general & administrative expenses in the Statements of Income.