Consolidated Condensed Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2021	83,034,000
Balance at Dec. 31, 2021	$ 830	$ 85,718	$ 565,129	$ 651,677
Net income	$ 0	0	27,533	27,533
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	220,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 2	766	0	768
Employee taxes paid in exchange for shares withheld	$ 0	(1,610)	0	(1,610)
Share-based payment arrangement compensation expense		369	0	369
Dividends on common stock		0	(4,975)	$ (4,975)
Issuance of common stock from share-based payment arrangement exercises (in shares)	220,000
Repurchase and retirement of common stock (in shares)	(1,307,000)			(1,300,000)
Repurchase and retirement of common stock	$ (13)	(24,987)	0	$ (25,000)
Balance (in shares) at Mar. 31, 2022	81,947,000
Balance at Mar. 31, 2022	$ 819	60,256	587,687	648,762
Balance (in shares) at Dec. 31, 2021	83,034,000
Balance at Dec. 31, 2021	$ 830	85,718	565,129	651,677
Net income				59,194
Balance (in shares) at Jun. 30, 2022	81,015,000
Balance at Jun. 30, 2022	$ 810	44,867	614,480	660,157
Balance (in shares) at Mar. 31, 2022	81,947,000
Balance at Mar. 31, 2022	$ 819	60,256	587,687	648,762
Net income		0	31,661	31,661
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	31,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 1	150	0	151
Share-based payment arrangement compensation expense		1,204	0	1,204
Dividends on common stock	$ 0	0	(4,868)	$ (4,868)
Issuance of common stock from share-based payment arrangement exercises (in shares)	31,000
Repurchase and retirement of common stock (in shares)	(963,000)			(963,000)
Repurchase and retirement of common stock	$ (10)	(16,743)	0	$ (16,753)
Balance (in shares) at Jun. 30, 2022	81,015,000
Balance at Jun. 30, 2022	$ 810	44,867	614,480	660,157
Balance (in shares) at Dec. 31, 2022	81,115,000
Balance at Dec. 31, 2022	$ 811	47,188	655,920	703,919
Net income	$ 0	0	22,502	22,502
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	119,000
Issuance of common stock from share-based payment arrangement exercises 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		354	0	354
Dividends on common stock	$ 0	0	(4,874)	(4,874)
Issuance of common stock from share-based payment arrangement exercises (in shares)	119,000
Balance (in shares) at Mar. 31, 2023	81,234,000
Balance at Mar. 31, 2023	$ 812	47,151	673,548	721,511
Balance (in shares) at Dec. 31, 2022	81,115,000
Balance at Dec. 31, 2022	$ 811	47,188	655,920	703,919
Net income				$ 44,376
Repurchase and retirement of common stock (in shares)				0
Balance (in shares) at Jun. 30, 2023	81,301,000
Balance at Jun. 30, 2023	$ 813	48,663	690,544	$ 740,020
Balance (in shares) at Mar. 31, 2023	81,234,000
Balance at Mar. 31, 2023	$ 812	47,151	673,548	721,511
Net income	$ 0	0	21,874	21,874
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	67,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 1	507	0	508
Share-based payment arrangement compensation expense		1,005	0	1,005
Dividends on common stock	$ 0	0	(4,878)	(4,878)
Issuance of common stock from share-based payment arrangement exercises (in shares)	67,000
Balance (in shares) at Jun. 30, 2023	81,301,000
Balance at Jun. 30, 2023	$ 813	$ 48,663	$ 690,544	$ 740,020