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, 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
Balance at beginning of period at Dec. 31, 2024	91	627,787	(1,563,614)	(124,758)	1,711,949	651,455
Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	0	145,713	145,713
Other comprehensive income (loss), net of tax	0	0	0	7,842	0	7,842
Repurchase of Class A common stock (Note 7)	0	0	(10,020)	0	0	(10,020)
Exercise of employee stock options/vesting of stock awards	0	(9,530)	8,359	0	0	(1,171)
Stock-based compensation	0	14,904	0	0	0	14,904
Cash dividends	0	0	0	0	(8,928)	(8,928)
Balance at end of period at Sep. 30, 2025	91	633,161	(1,565,275)	(116,916)	1,848,734	799,795
Balance at beginning of period at Jun. 30, 2025	91	627,515	(1,560,411)	(114,058)	1,834,617	787,754
Stockholders' Equity [Roll Forward]
Net income (loss)	0	0	0	0	17,079	17,079
Other comprehensive income (loss), net of tax	0	0	0	(2,858)	0	(2,858)
Repurchase of Class A common stock (Note 7)	0	0	(5,008)	0	0	(5,008)
Exercise of employee stock options/vesting of stock awards	0	(173)	144	0	0	(29)
Stock-based compensation	0	5,819	0	0	0	5,819
Cash dividends	0	0	0	0	(2,962)	(2,962)
Balance at end of period at Sep. 30, 2025	$ 91	$ 633,161	$ (1,565,275)	$ (116,916)	$ 1,848,734	$ 799,795