CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock, Common	Treasury Stock, Common	Retained Earnings [Member]
Balance (shares) at Dec. 31, 2020	55,489
Balance at Dec. 31, 2020	$ 44,132	$ 555	$ 95,528	$ (626,984)	$ 5	$ 575,028
Treasury Stock, Value, Acquired, Cost Method	(69,725)	0	0	(69,725)	0	0
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture	0	0	(25,140)	26,479	0	(1,339)
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	40,623	0	37,381	3,242	0	0
Stock Issued During Period, Value, Stock Options Exercised	240	0	(329)	569	0	0
Stockholders' Equity, Other	3,069	0	(1,739)	(1,330)	0	0
Dividends, Common Stock, Cash	(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
Treasury Stock, Value, Acquired, Cost Method	$ (73,285)	0	0	(73,285)	0	0
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture	0	0	(9,285)	10,443	0	(1,158)
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	50,080	0	49,124	956	0	0
Stockholders' Equity, Other	3,569	0	2,126	1,443	0	0
Dividends, Common Stock, Cash	(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
Treasury Stock, Value, Acquired, Cost Method	$ (132,063)	0	0	(132,063)	0	0
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture	0	0	(21,285)	25,085	0	(3,800)
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	52,996	0	52,678	318	0	0
Stockholders' Equity, Other	4,162	0	2,494	1,668	0	0
Dividends, Common Stock, Cash	(84,219)	0	0	0	0	(84,219)
Unrealized gain (loss) on marketable securities, net of tax	91	0	0	0	91	0
Net income	171,382	0	0	0	0	171,382
Balance at Dec. 31, 2023	$ 93,624	$ 555	$ 185,031	$ (830,524)	$ 9	$ 738,553
Balance (shares) at Dec. 31, 2023	55,489