Condensed Consolidated Statements of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Capital Stock Preferred	Issued Common	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive income	Treasury Stock	Non-controlling Interest
Balance at beginning of period at Dec. 31, 2019	$ 231,044	$ 4	$ 6,715	$ 14,029	$ 230,784	$ (246)	$ (20,242)
Comprehensive income:
Net income	9,842				9,842
Other comprehensive income (loss)	(6)					(6)
Dividends and dividend equivalents of $0.12 per common share and per restricted stock unit, net of estimated forfeitures	(2,059)				(2,059)
Share-based compensation	902			902
Stock shares awarded, forfeited or vested	237			(567)			804
Stock shares repurchased	(4,395)						(4,395)
Balance at end of period at Mar. 31, 2020	235,565	4	6,715	14,364	238,567	(252)	(23,833)
Balance at beginning of period at Dec. 31, 2019	231,044	4	6,715	14,029	230,784	(246)	(20,242)
Comprehensive income:
Net income	28,713
Other comprehensive income (loss)	89
Balance at end of period at Sep. 30, 2020	252,001	4	6,715	15,284	253,354	(157)	(23,199)
Balance at beginning of period at Mar. 31, 2020	235,565	4	6,715	14,364	238,567	(252)	(23,833)
Comprehensive income:
Net income	8,490				8,490
Other comprehensive income (loss)	21					21
Dividends and dividend equivalents of $0.12 per common share and per restricted stock unit, net of estimated forfeitures	(2,041)				(2,041)
Share-based compensation	662			662
Balance at end of period at Jun. 30, 2020	242,697	4	6,715	15,026	245,016	(231)	(23,833)
Comprehensive income:
Net income	10,381				10,381
Other comprehensive income (loss)	74					74
Dividends and dividend equivalents of $0.12 per common share and per restricted stock unit, net of estimated forfeitures	(2,043)				(2,043)
Share-based compensation	258			258
Stock shares awarded, forfeited or vested	634						634
Balance at end of period at Sep. 30, 2020	252,001	4	6,715	15,284	253,354	(157)	(23,199)
Balance at beginning of period at Dec. 31, 2020	262,526	4	6,715	15,503	262,943	486	(23,125)	$ 0
Comprehensive income:
Net income	15,427				15,427
Other comprehensive income (loss)	55					55
Dividends and dividend equivalents of $0.12 per common share and per restricted stock unit, net of estimated forfeitures	(2,052)				(2,052)
Share-based compensation	3,229			3,229
Stock shares awarded, forfeited or vested	0			(716)			716
Stock shares repurchased	(674)						(674)
Balance at end of period at Mar. 31, 2021	278,511	4	6,715	18,016	276,318	541	(23,083)	0
Balance at beginning of period at Dec. 31, 2020	262,526	4	6,715	15,503	262,943	486	(23,125)	0
Comprehensive income:
Net income	59,159
Other comprehensive income (loss)	(174)
Balance at end of period at Sep. 30, 2021	614,911	4	6,715	315,543	315,022	312	(22,406)	(279)
Balance at beginning of period at Mar. 31, 2021	278,511	4	6,715	18,016	276,318	541	(23,083)	0
Comprehensive income:
Net income	20,059				20,135			(76)
Other comprehensive income (loss)	1					1
Dividends and dividend equivalents of $0.12 per common share and per restricted stock unit, net of estimated forfeitures	(2,653)				(2,653)
Share-based compensation	1,538			1,538
Stock shares awarded, forfeited or vested	0			(705)			705
Stock shares repurchased	(91)						(91)
Equity consideration for Merger	296,213			296,213
Balance at end of period at Jun. 30, 2021	593,578	4	6,715	315,062	293,800	542	(22,469)	(76)
Comprehensive income:
Net income	23,673
Net income	23,673				23,876			(203)
Other comprehensive income (loss)	(230)					(230)
Dividends and dividend equivalents of $0.12 per common share and per restricted stock unit, net of estimated forfeitures	(2,654)				(2,654)
Share-based compensation	480			480
Stock shares awarded, forfeited or vested	0			(64)			64
Stock shares repurchased	(1)						(1)
Equity consideration for Merger	65			65
Balance at end of period at Sep. 30, 2021	$ 614,911	$ 4	$ 6,715	$ 315,543	$ 315,022	$ 312	$ (22,406)	$ (279)