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, 2020	908,326	282	227,407	731,710	7,089	(58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	205,410
Ending balance at Sep. 30, 2021	1,031,140	284	213,271	871,600	4,147	(58,162)
Beginning balance at Mar. 31, 2021	959,587	283	227,400	786,566	3,500	(58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	67,889			67,889
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(158)	1	(159)
Stock-based compensation expense	6,423		6,423
Other comprehensive income (loss)	2,440				2,440
Cash dividends	(22,739)			(22,739)
Dividend equivalents on stock-based awards	0		388	(388)
Ending balance at Jun. 30, 2021	986,176	284	206,786	831,328	5,940	(58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature	(75,750)		(75,750)
Issuance of warrants	48,484		48,484
Net income	63,401			63,401
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(333)		(333)
Stock-based compensation expense	6,436		6,436
Other comprehensive income (loss)	(1,793)				(1,793)
Cash dividends	(22,747)			(22,747)
Dividend equivalents on stock-based awards	0		382	(382)
Ending balance at Sep. 30, 2021	1,031,140	284	213,271	871,600	4,147	(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)
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
Issuance of shares of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(32)	0	(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)