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, 2020	$ 908,326	$ 282	$ 227,407	$ 731,710	$ 7,089	$ (58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	74,120			74,120
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(7,767)	1	(7,768)
Stock-based compensation expense	7,436		7,436
Other comprehensive income (loss)	(3,589)				(3,589)
Cash dividends	(18,939)			(18,939)
Dividend equivalents on stock-based awards	0		325	(325)
Ending balance at Mar. 31, 2021	959,587	283	227,400	786,566	3,500	(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	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)