Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (20)	$ (14)	$ (12)	$ (1,479)
Accumulated other comprehensive income (loss), beginning balance	(78,656)	(61,866)	(91,362)
Other comprehensive income (loss) before reclassifications:
Actuarial gain (loss) for retiree liabilities	14,315	(25,638)	20,800
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax	(6)	(2)	(18)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax			2,253
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax		0	(768)
Amounts reclassified from accumulated other comprehensive income:
Actuarial costs (reclassified to salaries, wages and benefits)	7,244	3,887	15,700
Income Tax (Expense) or Benefit	(4,977)	4,963	(9,239)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(6)	(2)	1,467
Other comprehensive income (loss), net of tax		(16,790)	29,496
Accumulated other comprehensive income (loss), ending balance	(62,080)	(78,656)	(61,866)
Total comprehensive income (loss)	247,996	15,325	90,698
Pension Plans [Member]
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(78,093)	(61,152)	(89,042)
Other comprehensive income (loss) before reclassifications:
Actuarial gain (loss) for retiree liabilities	14,087	(25,712)	20,793
Amounts reclassified from accumulated other comprehensive income:
Actuarial costs (reclassified to salaries, wages and benefits)	7,056	3,763	15,528
Income Tax (Expense) or Benefit	(4,881)	5,008	(8,431)
Other comprehensive income (loss), net of tax	16,262	(16,941)	27,890
Accumulated other comprehensive income (loss), ending balance	(61,831)	(78,093)	(61,152)
Post-Retirement Plans [Member]
Schedule of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive income (loss), beginning balance	(549)	(702)	(841)
Other comprehensive income (loss) before reclassifications:
Actuarial gain (loss) for retiree liabilities	228	74	7
Amounts reclassified from accumulated other comprehensive income:
Actuarial costs (reclassified to salaries, wages and benefits)	188	124	172
Income Tax (Expense) or Benefit	(96)	(45)	(40)
Other comprehensive income (loss), net of tax	320	153	139
Accumulated other comprehensive income (loss), ending balance	$ (229)	$ (549)	$ (702)