Condensed Consolidated Statement Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2021	$ 1,092,875	$ 284	$ 220,459	$ 930,795	$ (501)	$ (58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	196,181			196,181
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(10,569)	1	(10,570)
Stock-based compensation expense	6,517		6,517
Other comprehensive income (loss)	(2,882)				(2,882)
Cash dividends	(22,870)			(22,870)
Dividend equivalents on stock-based awards	0		392	(392)
Ending balance at Mar. 31, 2022	1,259,252	285	216,798	1,103,714	(3,383)	(58,162)
Beginning balance at Dec. 31, 2021	1,092,875	284	220,459	930,795	(501)	(58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	412,103
Ending balance at Sep. 30, 2022	1,423,557	285	231,518	1,265,324	(15,408)	(58,162)
Beginning balance at Mar. 31, 2022	1,259,252	285	216,798	1,103,714	(3,383)	(58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	154,530			154,530
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(204)	0	(204)
Stock-based compensation expense	7,184		7,184
Other comprehensive income (loss)	297				297
Cash dividends	(26,702)			(26,702)
Dividend equivalents on stock-based awards	0		453	(453)
Ending balance at Jun. 30, 2022	1,394,357	285	224,231	1,231,089	(3,086)	(58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	61,392			61,392
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(32)		(32)
Stock-based compensation expense	6,863		6,863
Other comprehensive income (loss)	(12,322)				(12,322)
Cash dividends	(26,701)			(26,701)
Dividend equivalents on stock-based awards	0		456	(456)
Ending balance at Sep. 30, 2022	1,423,557	285	231,518	1,265,324	(15,408)	(58,162)
Beginning balance at Dec. 31, 2022	1,381,008	285	234,956	1,221,279	6,704	(82,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,259			7,259
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(8,888)	1	(8,889)
Stock-based compensation expense	4,695		4,695
Other comprehensive income (loss)	2,000				2,000
Cash dividends	(26,563)			(26,563)
Dividend equivalents on stock-based awards	0		532	(532)
Ending balance at Mar. 31, 2023	1,359,511	286	231,294	1,201,443	8,704	(82,216)
Beginning balance at Dec. 31, 2022	1,381,008	285	234,956	1,221,279	6,704	(82,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	66,572
Ending balance at Sep. 30, 2023	1,372,140	287	240,972	1,206,525	6,572	(82,216)
Beginning balance at Mar. 31, 2023	1,359,511	286	231,294	1,201,443	8,704	(82,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,426			33,426
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(697)	0	(697)
Stock-based compensation expense	4,385		4,385
Other comprehensive income (loss)	863				863
Cash dividends	(26,591)			(26,591)
Dividend equivalents on stock-based awards	0		525	(525)
Ending balance at Jun. 30, 2023	1,370,897	286	235,507	1,207,753	9,567	(82,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,887
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(6)	1	(7)
Stock-based compensation expense	4,947		4,947
Other comprehensive income (loss)	(2,995)				(2,995)
Cash dividends	(26,590)			(26,590)
Dividend equivalents on stock-based awards	0		525	(525)
Ending balance at Sep. 30, 2023	$ 1,372,140	$ 287	$ 240,972	$ 1,206,525	$ 6,572	$ (82,216)