CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Total
Balance at Dec. 31, 2020	$ 21,495		$ 627,778	$ (17,706)	$ 631,567
Balance (in shares) at Dec. 31, 2020	214,951,000
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ 93	$ 1,446			1,539
Stock issued for stock incentive plans, net (in shares)	924,000
Stock purchased and retired	$ (14)	(1,446)	903		(557)
Stock purchased and retired (in shares)	(140,000)
Net income (loss)			(9,662)		(9,662)
Pension adjustment, net of taxes				153	153
Foreign currency translation				136	136
Balance at Mar. 31, 2021	$ 21,574		619,019	(17,417)	623,176
Balance (in shares) at Mar. 31, 2021	215,735,000
Balance at Dec. 31, 2020	$ 21,495		627,778	(17,706)	631,567
Balance (in shares) at Dec. 31, 2020	214,951,000
Increase (Decrease) in Stockholders' Equity
Net income (loss)					(5,122)
Foreign currency translation					(34)
Balance at Sep. 30, 2021	$ 21,564		626,501	(17,282)	630,783
Balance (in shares) at Sep. 30, 2021	215,643,000
Balance at Mar. 31, 2021	$ 21,574		619,019	(17,417)	623,176
Balance (in shares) at Mar. 31, 2021	215,735,000
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ (1)	1,472			1,471
Stock issued for stock incentive plans, net (in shares)	(9,000)
Stock purchased and retired		(1,472)	1,463		(9)
Stock purchased and retired (in shares)	(1,000)
Net income (loss)			(726)		(726)
Pension adjustment, net of taxes				153	153
Foreign currency translation				69	69
Balance at Jun. 30, 2021	$ 21,573		619,756	(17,195)	624,134
Balance (in shares) at Jun. 30, 2021	215,725,000
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ (9)	1,480			1,471
Stock issued for stock incentive plans, net (in shares)	(82,000)
Stock purchased and retired		(1,480)	1,479		(1)
Net income (loss)			5,266		5,266
Pension adjustment, net of taxes				152	152
Foreign currency translation				(239)	(239)
Balance at Sep. 30, 2021	$ 21,564		626,501	(17,282)	630,783
Balance (in shares) at Sep. 30, 2021	215,643,000
Balance at Dec. 31, 2021	$ 21,563		640,936	(20,708)	$ 641,791
Balance (in shares) at Dec. 31, 2021	215,629,000				215,628,716
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ 104	1,393			$ 1,497
Stock issued for stock incentive plans, net (in shares)	1,037,000
Stock purchased and retired	$ (19)	(1,393)	502		(910)
Stock purchased and retired (in shares)	(190,000)
Net income (loss)			15,079		15,079
Pension adjustment, net of taxes				195	195
Foreign currency translation				116	116
Balance at Mar. 31, 2022	$ 21,648		656,517	(20,397)	657,768
Balance (in shares) at Mar. 31, 2022	216,476,000
Balance at Dec. 31, 2021	$ 21,563		640,936	(20,708)	$ 641,791
Balance (in shares) at Dec. 31, 2021	215,629,000				215,628,716
Increase (Decrease) in Stockholders' Equity
Net income (loss)					$ 131,358
Foreign currency translation					91
Balance at Sep. 30, 2022	$ 21,663		771,779	(20,032)	$ 773,410
Balance (in shares) at Sep. 30, 2022	216,631,000				216,631,140
Balance at Mar. 31, 2022	$ 21,648		656,517	(20,397)	$ 657,768
Balance (in shares) at Mar. 31, 2022	216,476,000
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ 18	1,677			1,695
Stock issued for stock incentive plans, net (in shares)	186,000
Stock purchased and retired		(1,677)	1,677
Net income (loss)			46,939		46,939
Pension adjustment, net of taxes				195	195
Foreign currency translation				65	65
Balance at Jun. 30, 2022	$ 21,666		705,133	(20,137)	706,662
Balance (in shares) at Jun. 30, 2022	216,662,000
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ (3)	1,575			1,572
Stock issued for stock incentive plans, net (in shares)	(31,000)
Stock purchased and retired		$ (1,575)	1,573		(2)
Net income (loss)			69,340		69,340
Pension adjustment, net of taxes				195	195
Foreign currency translation				(90)	(90)
Dividends declared			(4,267)
Balance at Sep. 30, 2022	$ 21,663		$ 771,779	$ (20,032)	$ 773,410
Balance (in shares) at Sep. 30, 2022	216,631,000				216,631,140