CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock, Common	Retained Earnings [Member]
Balance at Dec. 31, 2021	$ (1,774)	$ 555	$ 109,179	$ (665,089)	$ 553,581
Balance (shares) at Dec. 31, 2021	55,489
Treasury Stock, Value, Acquired, Cost Method	$ (63,420)	0	0	(63,420)	0
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture	0	0	(9,285)	10,443	(1,158)
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	38,818	0	37,866	952	0
Stockholders' Equity, Other	2,678	0	1,610	1,068	0
Dividends, Common Stock, Cash	(56,866)	0	0	0	(56,866)
Unrealized gain (loss) on marketable securities, net of tax	(85)	0	0	0	(85)
Net income	141,152	0	0	0	141,152
Balance at Sep. 30, 2022	$ 60,503	555	139,370	(716,046)	636,624
Balance (shares) at Sep. 30, 2022	55,489
Balance at Jun. 30, 2022	$ 35,132	555	125,622	(709,810)	618,765
Balance (shares) at Jun. 30, 2022	55,489
Treasury Stock, Value, Acquired, Cost Method	$ (6,615)	0	0	(6,615)	0
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture	0	0	(37)	44	(7)
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	13,341	0	13,339	2	0
Stockholders' Equity, Other	779	0	446	333	0
Dividends, Common Stock, Cash	(19,769)	0	0	0	(19,769)
Unrealized gain (loss) on marketable securities, net of tax	(34)	0	0	0	(34)
Net income	37,669	0	0	0	37,669
Balance at Sep. 30, 2022	$ 60,503	555	139,370	(716,046)	636,624
Balance (shares) at Sep. 30, 2022	55,489
Balance at Dec. 31, 2022	$ 81,275	555	151,144	(725,532)	655,108
Balance (shares) at Dec. 31, 2022	55,489
Treasury Stock, Value, Acquired, Cost Method	$ (132,018)	0	0	(132,018)	0
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture	0	0	(21,231)	25,024	(3,793)
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	41,676	0	41,360	316	0
Stockholders' Equity, Other	3,256	0	2,034	1,222	0
Dividends, Common Stock, Cash	(62,969)	0	0	0	(62,969)
Unrealized gain (loss) on marketable securities, net of tax	78	0	0	0	78
Net income	151,821	0	0	0	151,821
Balance at Sep. 30, 2023	$ 83,119	555	173,307	(830,988)	740,245
Balance (shares) at Sep. 30, 2023	55,489
Balance at Jun. 30, 2023	$ 130,519	555	157,526	(744,788)	717,226
Balance (shares) at Jun. 30, 2023	55,489
Treasury Stock, Value, Acquired, Cost Method	$ (86,645)	0	0	(86,645)	0
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture	0	0	(54)	62	(8)
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	15,210	0	15,209	1	0
Stockholders' Equity, Other	1,008	0	626	382	0
Dividends, Common Stock, Cash	(21,338)	0	0	0	(21,338)
Unrealized gain (loss) on marketable securities, net of tax	33	0	0	0	33
Net income	44,332	0	0	0	44,332
Balance at Sep. 30, 2023	$ 83,119	$ 555	$ 173,307	$ (830,988)	$ 740,245
Balance (shares) at Sep. 30, 2023	55,489