Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member] Class A [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total
Balance at beginning of period at Dec. 31, 2022	$ 91	$ 613,278	$ (1,569,061)	$ (86,509)	$ 1,939,497	$ 897,296
Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	0	1,313	1,313
Other comprehensive income (loss), net of tax	0	0	0	(22,327)	0	(22,327)
Repurchase of Class A common stock (Note 6)	0	0	(13,011)	0	0	(13,011)
Exercise of employee stock options/vesting of stock awards	0	(6,613)	11,354	0	0	4,741
Stock-based compensation	0	12,528	0	0	0	12,528
Cash dividends	0	0	0	0	(58,353)	(58,353)
Balance at end of period at Sep. 30, 2023	91	619,193	(1,570,718)	(108,836)	1,882,457	822,187
Balance at beginning of period at Jun. 30, 2023	91	615,579	(1,557,777)	(101,446)	1,938,898	895,345
Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	0	(36,955)	(36,955)
Other comprehensive income (loss), net of tax	0	0	0	(7,390)	0	(7,390)
Repurchase of Class A common stock (Note 6)	0	0	(13,011)	0	0	(13,011)
Exercise of employee stock options/vesting of stock awards	0	(111)	70	0	0	(41)
Stock-based compensation	0	3,725	0	0	0	3,725
Cash dividends	0	0	0	0	(19,486)	(19,486)
Balance at end of period at Sep. 30, 2023	91	619,193	(1,570,718)	(108,836)	1,882,457	822,187
Balance at beginning of period at Dec. 31, 2023	91	621,853	(1,570,440)	(100,006)	1,870,470	821,968
Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	0	(110,489)	(110,489)
Other comprehensive income (loss), net of tax	0	0	0	(5,034)	0	(5,034)
Exercise of employee stock options/vesting of stock awards	0	(8,566)	6,562	0	0	(2,004)
Stock-based compensation	0	11,378	0	0	0	11,378
Cash dividends	0	0	0	0	(8,944)	(8,944)
Balance at end of period at Sep. 30, 2024	91	624,665	(1,563,878)	(105,040)	1,751,037	706,875
Balance at beginning of period at Jun. 30, 2024	91	621,440	(1,564,090)	(116,995)	1,745,718	686,164
Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	0	8,302	8,302
Other comprehensive income (loss), net of tax	0	0	0	11,955	0	11,955
Exercise of employee stock options/vesting of stock awards	0	(265)	212	0	0	(53)
Stock-based compensation	0	3,490	0	0	0	3,490
Cash dividends	0	0	0	0	(2,983)	(2,983)
Balance at end of period at Sep. 30, 2024	$ 91	$ 624,665	$ (1,563,878)	$ (105,040)	$ 1,751,037	$ 706,875