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, 2019	$ 21,443		$ 832,113	$ (23,223)	$ 830,333
Balance (in shares) at Dec. 31, 2019	214,423,000
Increase (Decrease) in Stockholders' Equity
Stock issued for stock incentive plans, net	$ 71	$ 8,664			8,735
Stock issued for stock incentive plans, net (in shares)	716,000
Stock purchased and retired	$ (19)	(8,664)	7,857		(826)
Stock purchased and retired (in shares)	(188,000)
Net income (loss)			(212,192)		(212,192)
Pension adjustment, net of taxes				5,727	5,727
Foreign currency translation				(210)	(210)
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	$ 82	6,494			6,576
Stock issued for stock incentive plans, net (in shares)	819,000
Stock purchased and retired	$ (14)	(6,494)	5,941		(567)
Stock purchased and retired (in shares)	(141,000)
Net income (loss)			7,217		7,217
Pension adjustment, net of taxes				(2,890)	(2,890)
Foreign currency translation				(112)	(112)
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	$ 114	6,261			$ 6,375
Stock issued for stock incentive plans, net (in shares)	1,139,000
Stock purchased and retired	$ (16)	$ (6,261)	5,359		(918)
Stock purchased and retired (in shares)	(159,000)
Net income (loss)			218,363		218,363
Pension adjustment, net of taxes				764	764
Foreign currency translation				5	5
Dividends declared			(8,645)		(8,645)
Balance at Dec. 31, 2022	$ 21,661		$ 856,013	$ (19,939)	$ 857,735
Balance (in shares) at Dec. 31, 2022	216,609,000				216,609,191