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
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	0	(547)	0	(547)
Share-based payment arrangement compensation expense	0	336	0	336
Dividends on common stock	$ 0	0	(3,311)	(3,311)
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				39,424
Net income				39,424
Balance (in shares) at Jun. 30, 2021	82,881,000
Balance at Jun. 30, 2021	$ 829	85,578	567,234	653,641
Balance (in shares) at Dec. 31, 2020	82,705,000
Balance at Dec. 31, 2020	$ 827	85,070	534,436	$ 620,333
Repurchase and retirement of common stock (in shares)				0
Balance (in shares) at Dec. 31, 2021	83,034,000
Balance at Dec. 31, 2021	$ 830	85,718	565,129	$ 651,677
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
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	0	930	0	930
Dividends on common stock	$ 0	0	(3,315)	(3,315)
Balance (in shares) at Jun. 30, 2021	82,881,000
Balance at Jun. 30, 2021	$ 829	85,578	567,234	653,641
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
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
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 2	766	0	$ 768
Repurchase and retirement of common stock	(13)	(24,987)	0	(25,000)
Employee taxes paid in exchange for shares withheld	0	(1,610)	0	(1,610)
Share-based payment arrangement compensation expense	0	369	0	369
Dividends on common stock	0	0	(4,975)	(4,975)
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
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	0	31,661	31,661
Net income	$ 0	0	31,661	$ 31,661
Repurchase and retirement of common stock (in shares)	(963,000)			(963,000)
Issuance of common stock from share-based payment arrangement exercises and vesting of performance unit awards	$ 1	150	0	$ 151
Repurchase and retirement of common stock	(10)	(16,743)	0	(16,753)
Share-based payment arrangement compensation expense	0	1,204	0	1,204
Dividends on common stock	0	0	(4,868)	(4,868)
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