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, 2020	82,705,000
Balance at Dec. 31, 2020	$ 827	$ 85,070	$ 534,436	$ 620,333
Net income	$ 0	0	18,006	18,006
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	70,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 1	160	0	161
Employee taxes paid in exchange for shares withheld		(547)		(547)
Share-based payment arrangement compensation expense		336		336
Dividends paid on common stock	$ 0	0	(3,311)	(3,311)
Share-based payment arrangement compensation expense		336		336
Balance (in shares) at Mar. 31, 2021	82,775,000
Balance at Mar. 31, 2021	$ 828	85,019	549,131	634,978
Balance (in shares) at Dec. 31, 2020	82,705,000
Balance at Dec. 31, 2020	$ 827	85,070	534,436	620,333
Net income				60,698
Balance (in shares) at Sep. 30, 2021	82,943,000
Balance at Sep. 30, 2021	$ 829	85,539	543,719	630,087
Balance (in shares) at Mar. 31, 2021	82,775,000
Balance at Mar. 31, 2021	$ 828	85,019	549,131	634,978
Net income	$ 0	0	21,418	21,418
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	106,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 1	335	0	336
Employee taxes paid in exchange for shares withheld	0	(706)	0	(706)
Share-based payment arrangement compensation expense		930		930
Dividends paid on common stock	$ 0	0	(3,315)	(3,315)
Share-based payment arrangement compensation expense		930		930
Balance (in shares) at Jun. 30, 2021	82,881,000
Balance at Jun. 30, 2021	$ 829	85,578	567,234	653,641
Net income	$ 0	0	21,274	$ 21,274
Repurchase and retirement of common stock (in shares)				0
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	62,000
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 0	61	0	$ 61
Employee taxes paid in exchange for shares withheld	0	(673)	0	(673)
Share-based payment arrangement compensation expense		573	0	573
Share-based payment arrangement compensation expense		573	0	573
Accrued dividends on common stock	$ 0	0	(44,789)	(44,789)
Balance (in shares) at Sep. 30, 2021	82,943,000
Balance at Sep. 30, 2021	$ 829	85,539	543,719	630,087
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
Repurchase and retirement of common stock (in shares)	(1,307,000)			(1,300,000)
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	220,000
Repurchase and retirement of common stock	$ (13)	(24,987)	0	$ (25,000)
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		(1,610)		(1,610)
Share-based payment arrangement compensation expense		369		369
Dividends paid on common stock	$ 0	0	(4,975)	(4,975)
Share-based payment arrangement compensation expense		369		369
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				84,840
Balance (in shares) at Sep. 30, 2022	81,097,000
Balance at Sep. 30, 2022	$ 811	46,366	635,260	682,437
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	0	31,661	$ 31,661
Repurchase and retirement of common stock (in shares)	(963,000)			(963,000)
Repurchase and retirement of common stock	$ (10)	(16,743)	0	$ (16,753)
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		1,204
Dividends paid on common stock	$ 0	0	(4,868)	(4,868)
Share-based payment arrangement compensation expense		1,204		1,204
Balance (in shares) at Jun. 30, 2022	81,015,000
Balance at Jun. 30, 2022	$ 810	44,867	614,480	660,157
Net income	$ 0	0	25,646	$ 25,646
Repurchase and retirement of common stock (in shares)				0
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards (in shares)	82,000
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 paid on common stock	0	0	(4,866)	(4,866)
Share-based payment arrangement compensation expense	$ 0	655	0	655
Balance (in shares) at Sep. 30, 2022	81,097,000
Balance at Sep. 30, 2022	$ 811	$ 46,366	$ 635,260	$ 682,437