Consolidated Statement Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Beginning Balance at Dec. 31, 2018	$ 706,255	$ 280	$ 203,246	$ 563,496	$ (2,605)	$ (58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	146,509			146,509
Issuance of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(8,084)	1	(8,085)
Stock-based compensation expense	16,077		16,077
Other comprehensive income (loss)	3,728				3,728
Cash dividends	(63,813)			(63,813)
Dividend equivalents on stock-based awards	0		1,247	(1,247)
Ending Balance at Dec. 31, 2019	800,672	281	212,485	644,945	1,123	(58,162)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	158,440			158,440
Issuance of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(4,853)	1	(4,854)
Stock-based compensation expense	18,502		18,502
Other comprehensive income (loss)	5,966				5,966
Cash dividends	(70,401)			(70,401)
Dividend equivalents on stock-based awards	0		1,274	(1,274)
Ending 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	287,739			287,739
Issuance of common stock pursuant to stock-based awards, net of shares tendered for payment of taxes	(8,324)	2	(8,326)
Stock-based compensation expense	27,161		27,161
Purchase of convertible note hedge contracts, net of tax	(75,750)		(75,750)
Issuance of warrants	48,484		48,484
Other comprehensive income (loss)	(7,590)				(7,590)
Cash dividends	(87,171)			(87,171)
Dividend equivalents on stock-based awards	0		1,483	(1,483)
Ending Balance at Dec. 31, 2021	$ 1,092,875	$ 284	$ 220,459	$ 930,795	$ (501)	$ (58,162)