Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2019	$ 682,604	$ 106,289	$ 576,419	$ (104)
Balance, Shares at Dec. 31, 2019		24,128,000
Net income	17,398		17,398
Share-based compensation	1,777	$ 1,777
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares		78,000
Taxes paid related to net share settlement of stock awards	(3,482)	$ (3,482)
Dividends accrued of $0.455 and $0.435, per share for three months ended March 31, 2022, and three months ended March 31,2021	(10,650)		(10,650)
Other comprehensive income	38			38
Balance at Mar. 31, 2020	687,685	$ 104,584	583,167	(66)
Balance, Shares at Mar. 31, 2020		24,206,000
Balance at Dec. 31, 2021	$ 732,021	$ 108,610	623,465	(54)
Balance, Shares at Dec. 31, 2021	24,260,000	24,260,000
Net income	$ 18,793		18,793
Share-based compensation	1,760	$ 1,760
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares		75,000
Taxes paid related to net share settlement of stock awards	(3,605)	$ (3,605)
Dividends accrued of $0.455 and $0.435, per share for three months ended March 31, 2022, and three months ended March 31,2021	(11,084)		(11,084)
Other comprehensive income	3			3
Balance at Mar. 31, 2022	$ 737,888	$ 106,765	$ 631,174	$ (51)
Balance, Shares at Mar. 31, 2022	24,335,000	24,335,000