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Note E - Accumulated Other Comprehensive Income (Loss) (Details) - Reclassifications out of Accumulated Other Comprehensive Loss (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Settlement loss (b) $ (82,510) $ (71,233)
Settlement loss (c) (12,861) (12,967)
Total before income tax 14,832 8,227
Income tax (4,878) (2,409)
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Recognized actuarial loss (a) 261 [1] 431 [1]
Settlement loss (b)    [2] 916 [2]
Settlement loss (c)    [3] 470 [3]
Total before income tax 261 1,817
Income tax (87) (608)
Net of income tax $ 174 $ 1,209
[1] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note D for additional details.
[2] This portion of the settlement loss is included in Cost of products sold on the Statements of Income.
[3] This portion of the settlement loss in included in Selling, general & administrative expenses on the Statements of Income.