Consolidated Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2021	83,034
Balance at Dec. 31, 2021	$ 830	$ 85,718	$ 565,129	$ 651,677
Net income	$ 0	0	27,533	$ 27,533
Repurchase and retirement of common stock (in shares)	(1,307)			(1,307)
Repurchase and retirement of common stock	$ (13)	(24,987)	0	$ (25,000)
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards (in shares)	220
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards	$ 2	766	0	768
Employee taxes paid in exchange for shares withheld		(1,610)		(1,610)
Share-based payment arrangement compensation expense		369		369
Dividends on common stock	$ 0	0	(4,975)	(4,975)
Balance (in shares) at Mar. 31, 2022	81,947
Balance at Mar. 31, 2022	$ 819	60,256	587,687	648,762
Net income	$ 0	0	82,821	82,821
Repurchase and retirement of common stock (in shares)	(963)
Repurchase and retirement of common stock	$ (10)	(16,743)	0	(16,753)
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards (in shares)	131
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards	$ 2	1,230	0	1,232
Share-based payment arrangement compensation expense		2,445		2,445
Dividends on common stock	$ 0	0	(14,588)	(14,588)
Balance (in shares) at Dec. 31, 2022	81,115
Balance at Dec. 31, 2022	$ 811	47,188	655,920	703,919
Net income	$ 0	0	22,502	$ 22,502
Repurchase and retirement of common stock (in shares)				0
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards (in shares)	119
Issuance of common stock from share-based payment arrangement exercises, deferred compensation plan distributions and vesting of performance unit awards	$ 1	535	0	$ 536
Employee taxes paid in exchange for shares withheld	0	(926)	0	(926)
Share-based payment arrangement compensation expense	0	354	0	354
Dividends on common stock	$ 0	0	(4,874)	(4,874)
Balance (in shares) at Mar. 31, 2023	81,234
Balance at Mar. 31, 2023	$ 812	$ 47,151	$ 673,548	$ 721,511