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
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	220
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
Net income	$ 0	0	27,533	27,533
Balance (in shares) at Mar. 31, 2022	81,947
Balance at Mar. 31, 2022	$ 819	60,256	587,687	648,762
Balance (in shares) at Dec. 31, 2021	83,034
Balance at Dec. 31, 2021	$ 830	85,718	565,129	651,677
Net income				84,840
Net income				84,840
Balance (in shares) at Sep. 30, 2022	81,097
Balance at Sep. 30, 2022	$ 811	46,366	635,260	682,437
Balance (in shares) at Mar. 31, 2022	81,947
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
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
Net income		0	31,661	31,661
Balance (in shares) at Jun. 30, 2022	81,015
Balance at Jun. 30, 2022	$ 810	44,867	614,480	660,157
Net income	$ 0	0	25,646	25,646
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	82
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 1	844	0	845
Share-based payment arrangement compensation expense	0	655	0	655
Dividends on common stock	$ 0	0	(4,866)	(4,866)
Issuance of common stock from share-based payment arrangement exercises (in shares)	82
Net income	$ 0	0	25,646	25,646
Balance (in shares) at Sep. 30, 2022	81,097
Balance at Sep. 30, 2022	$ 811	46,366	635,260	682,437
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
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	119
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
Net income	$ 0	0	22,502	22,502
Balance (in shares) at Mar. 31, 2023	81,234
Balance at Mar. 31, 2023	$ 812	47,151	673,548	721,511
Balance (in shares) at Dec. 31, 2022	81,115
Balance at Dec. 31, 2022	$ 811	47,188	655,920	703,919
Net income				57,974
Net income				57,974
Balance (in shares) at Sep. 30, 2023	81,309
Balance at Sep. 30, 2023	$ 813	49,280	699,264	749,357
Balance (in shares) at Mar. 31, 2023	81,234
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
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
Net income	$ 0	0	21,874	21,874
Balance (in shares) at Jun. 30, 2023	81,301
Balance at Jun. 30, 2023	$ 813	48,663	690,544	740,020
Net income	$ 0	0	13,598	13,598
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	8
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 0	116	0	116
Share-based payment arrangement compensation expense		501	0	501
Dividends on common stock			(4,878)	(4,878)
Issuance of common stock from share-based payment arrangement exercises (in shares)	8
Net income	$ 0	0	13,598	13,598
Balance (in shares) at Sep. 30, 2023	81,309
Balance at Sep. 30, 2023	$ 813	$ 49,280	$ 699,264	$ 749,357