CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2019	$ 4,079	$ 555	$ 48,141	$ (544,102)	$ 12	$ 499,473
Balance (shares) at Dec. 31, 2019		55,489
Purchase of treasury stock, at cost	(99,415)	$ 0	0	(99,415)	0	0
Issuance of long-term incentive awards and dividend equivalents	0	0	(7,140)	7,953	0	(813)
Stock-based compensation expense	60,145	0	53,561	6,584	0	0
Other	2,962	0	966	1,996	0	0
Dividends paid	(61,869)	0	0	0	0	(61,869)
Unrealized gain (loss) on marketable securities, net of tax	(7)	0	0	0	(7)	0
Net income	138,237	0	0	0	0	138,237
Balance at Dec. 31, 2020	44,132	$ 555	95,528	(626,984)	5	575,028
Balance (shares) at Dec. 31, 2020		55,489
Purchase of treasury stock, at cost	(69,725)	$ 0	0	(69,725)	0	0
Issuance of long-term incentive awards and dividend equivalents	0	0	(25,140)	26,479	0	(1,339)
Stock-based compensation expense	40,623	0	37,381	3,242	0	0
Exercise of stock options	240	0	(329)	569	0	0
Other	3,069	0	1,739	1,330	0	0
Dividends paid	(144,179)	0	0	0	0	(144,179)
Unrealized gain (loss) on marketable securities, net of tax	(14)	0	0	0	(14)	0
Net income	124,080	0	0	0	0	124,080
Balance at Dec. 31, 2021	(1,774)	$ 555	109,179	(665,089)	(9)	553,590
Balance (shares) at Dec. 31, 2021		55,489
Purchase of treasury stock, at cost	(73,285)	$ 0	0	(73,285)	0	0
Issuance of long-term incentive awards and dividend equivalents	0	0	(9,285)	10,443	0	(1,158)
Stock-based compensation expense	50,080	0	49,124	956	0	0
Other	3,569	0	2,126	1,443	0	0
Dividends paid	(76,592)	0	0	0	0	(76,592)
Unrealized gain (loss) on marketable securities, net of tax	(73)	0	0	0	(73)	0
Net income	179,350	0	0	0	0	179,350
Balance at Dec. 31, 2022	$ 81,275	$ 555	$ 151,144	$ (725,532)	$ (82)	$ 655,190
Balance (shares) at Dec. 31, 2022		55,489