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, 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)		(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			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)
Beginning balance at Dec. 31, 2023	1,355,036	287	245,659	1,177,034	14,272	(82,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	36,545			36,545
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(9,040)	1	(9,041)
Stock-based compensation expense	4,327		4,327
Other comprehensive income (loss)	(3,263)				(3,263)
Cash dividends	(26,721)			(26,721)
Dividend equivalents on stock-based awards	0		569	(569)
Ending balance at Mar. 31, 2024	1,356,884	288	241,514	1,186,289	11,009	(82,216)
Beginning balance at Dec. 31, 2023	1,355,036	287	245,659	1,177,034	14,272	(82,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	133,320
Ending balance at Sep. 30, 2024	1,418,322	288	252,208	1,228,454	19,588	(82,216)
Beginning balance at Mar. 31, 2024	1,356,884	288	241,514	1,186,289	11,009	(82,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	61,163			61,163
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(71)		(71)
Stock-based compensation expense	4,974		4,974
Other comprehensive income (loss)	(1,803)				(1,803)
Cash dividends	(26,734)			(26,734)
Dividend equivalents on stock-based awards	0		567	(567)
Ending balance at Jun. 30, 2024	1,394,413	288	246,984	1,220,151	9,206	(82,216)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,612
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(8)		(8)
Stock-based compensation expense	4,659		4,659
Other comprehensive income (loss)	10,382				10,382
Cash dividends	(26,736)			(26,736)
Dividend equivalents on stock-based awards	0		573	(573)
Ending balance at Sep. 30, 2024	$ 1,418,322	$ 288	$ 252,208	$ 1,228,454	$ 19,588	$ (82,216)