Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Capital Stock, Common	Additional Paid-in Capital	Retained Earnings	Treasury Stock
Balance at Dec. 31, 2020	$ 724,334	$ 907	$ 4,330	$ 890,970	$ (171,873)
Net income	13,734	0	0	13,734	0
Dividends on common stock, $0.02 per share	(1,599)	0	0	(1,599)	0
Repurchases of common stock	(14,537)	0	0	0	(14,537)
Stock-based compensation, net of tax	485	0	146	0	339
Balance at Mar. 31, 2021	722,417	907	4,476	903,105	(186,071)
Net income	20,742	0	0	20,742	0
Dividends on common stock, $0.02 per share	(1,598)	0	0	(1,598)	0
Stock-based compensation, net of tax	205	0	55	0	150
Balance at Jun. 30, 2021	741,766	907	4,531	922,249	(185,921)
Balance at Dec. 31, 2021	727,102	907	4,141	924,375	(202,321)
Net income	16,775	0	0	16,775	0
Dividends on common stock, $0.02 per share	(1,579)	0	0	(1,579)	0
Stock-based compensation, net of tax	230	0	64	0	166
Balance at Mar. 31, 2022	742,528	907	4,205	939,571	(202,155)
Net income	76,906	0	0	76,906	0
Dividends on common stock, $0.02 per share	(1,579)	0	0	(1,579)	0
Stock-based compensation, net of tax	47	0	(14)	0	61
Balance at Jun. 30, 2022	$ 817,902	$ 907	$ 4,191	$ 1,014,898	$ (202,094)