CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income (loss)	$ 948,581	$ (295,697)	$ 446,906
Other comprehensive Income (loss):
Foreign currency translation (loss) gain	(2,959)	8,450	(192)
Unrealized (loss) gain on marketable securities, net of tax	(1,289)	95	1,137
Defined benefit pension obligations, net of tax	154	(8,363)	(6,322)
Other comprehensive income (loss)	(4,094)	182	(5,377)
Comprehensive income (loss)	$ 944,487	$ (295,515)	$ 441,529