Condensed Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member] Common Class A [Member]	Common Stock [Member] Common Class B [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Retained Earnings [Member]	Total
Shares, Outstanding, Beginning Balance at Dec. 31, 2020	77,284	22,430
Total equity, beginning of period at Dec. 31, 2020	$ 77	$ 22	$ 457,161	$ 3,955	$ 1,045,082	$ 1,506,297
Stock-based compensation			7,883			7,883
Grant of restricted stock units			163			163
Exercise of stock options (shares)	303
Exercise of stock options	$ 1		9,100			9,101
Comprehensive income/(loss)				(5,779)	45,329	39,550
Total equity, end of period at Mar. 31, 2021	$ 78	$ 22	474,307	(1,824)	1,090,411	1,562,994
Shares, Outstanding, Ending Balance at Mar. 31, 2021	77,587	22,430
Shares, Outstanding, Beginning Balance at Dec. 31, 2021	79,114	22,430
Total equity, beginning of period at Dec. 31, 2021	$ 79	$ 22	553,787	(6,772)	1,194,272	1,741,388
Stock-based compensation			8,353			8,353
Grant of restricted stock units			196			$ 196
Exercise of stock options (shares)	184					184
Exercise of stock options			7,746			$ 7,746
Comprehensive income/(loss)				(10,395)	38,084	27,689
Total equity, end of period at Mar. 31, 2022	$ 79	$ 22	$ 570,082	$ (17,167)	$ 1,232,356	$ 1,785,372
Shares, Outstanding, Ending Balance at Mar. 31, 2022	79,298	22,430