Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
NET EARNINGS	$ 51,042,000	$ 64,672,000	$ 155,930,000	$ 186,896,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0	0
OTHER COMPREHENSIVE INCOME:
TOTAL COMPREHENSIVE INCOME, net of tax	51,824,000	66,070,000	157,213,000	191,090,000
Accumulated Deficit [Member]
OTHER COMPREHENSIVE INCOME:
TOTAL COMPREHENSIVE INCOME, net of tax	51,042,000	64,672,000	155,930,000	186,896,000
Pension Plans [Member]
Other comprehensive income (loss), net of tax	773,000	1,362,000	1,256,000	4,086,000
OTHER COMPREHENSIVE INCOME:
Income tax (expense) or benefit	(229,000)	(402,000)	(372,000)	(1,206,000)
Post-Retirement Plans [Member]
Other comprehensive income (loss), net of tax	9,000	36,000	27,000	108,000
OTHER COMPREHENSIVE INCOME:
Income tax (expense) or benefit	$ (2,000)	$ (11,000)	$ (7,000)	$ (33,000)