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	(533)	(533)
Other comprehensive income (loss), net of tax	0	0	0	(10,601)	0	(10,601)
Exercise of employee stock options/vesting of stock awards	0	(7,389)	5,498	0	0	(1,891)
Stock-based compensation	0	4,242	0	0	0	4,242
Cash dividends	0	0	0	0	(2,979)	(2,979)
Balance at end of period at Mar. 31, 2024	91	618,706	(1,564,942)	(110,607)	1,866,958	810,206
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	107,515	107,515
Other comprehensive income (loss), net of tax	0	0	0	908	0	908
Repurchase of Class A common stock (Note 7)	0	0	(5,012)	0	0	(5,012)
Exercise of employee stock options/vesting of stock awards	0	(7,577)	6,415	0	0	(1,162)
Stock-based compensation	0	3,267	0	0	0	3,267
Cash dividends	0	0	0	0	(3,002)	(3,002)
Balance at end of period at Mar. 31, 2025	$ 91	$ 623,477	$ (1,562,211)	$ (123,850)	$ 1,816,462	$ 753,969