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Note G - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Plan [Member]      
Service cost $ 3,064 $ 2,904 $ 3,144
Interest cost 2,640 2,895 2,851
Expected return on plan assets (4,060) (4,755) (5,080)
Recognized actuarial loss 2,230 $ 1,664 2,080
Settlement loss 3,783 4,169
Net periodic benefit cost 7,657 $ 2,708 7,164
Net loss (gain) 1,156 4,541 (10,734)
Total expense (income) recognized in net periodic benefit cost and other comprehensive income 8,813 7,249 (3,570)
Postretirement Plan [Member]      
Service cost 1,194 907 1,153
Interest cost 790 845 724
Recognized actuarial loss (649) (1,181) (723)
Net periodic benefit cost 1,335 571 1,154
Net loss (gain) (529) 4,233 (3,717)
Total expense (income) recognized in net periodic benefit cost and other comprehensive income $ 806 $ 4,804 $ (2,563)