Note K - Accumulated Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Balance as of January 1, 2023	$ 1,368,702	$ 1,412,506
Balance as of March 31, 2023	1,381,425	1,414,067
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Balance as of January 1, 2023	(57,931)	(103,418)
Actuarial costs (reclassified to salaries, wages and benefits)	2,594	4,745
Income Tax (Expense) or Benefit	(610)	(1,040)
Other comprehensive income (loss), net of tax	1,984	3,705
Balance as of March 31, 2023	(55,947)	(99,713)
Accumulated Defined Benefit Post Retirement Plans Adjustment Attributable to Parent [Member]
Balance as of January 1, 2023	502	36
Actuarial costs (reclassified to salaries, wages and benefits)	(23)	0
Income Tax (Expense) or Benefit	6	0
Other comprehensive income (loss), net of tax	(17)	0
Balance as of March 31, 2023	485	36
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance as of January 1, 2023	0	(20)
Actuarial costs (reclassified to salaries, wages and benefits)	0	0
Income Tax (Expense) or Benefit	0	0
Other comprehensive income (loss), net of tax	0	0
Balance as of March 31, 2023	0	(20)
AOCI Attributable to Parent [Member]
Balance as of January 1, 2023	(57,429)	(103,402)
Actuarial costs (reclassified to salaries, wages and benefits)	2,571	4,745
Income Tax (Expense) or Benefit	(604)	(1,040)
Other comprehensive income (loss), net of tax	1,967	3,705
Balance as of March 31, 2023	$ (55,462)	$ (99,697)