CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income (loss)	$ 53,535	$ (720,642)
Other comprehensive Income (loss):
Foreign currency translation	(5,308)	1,560
Unrealized gain on marketable securities, net of tax	(32)	654
Defined benefit pension obligations, net of tax	342	221
Other comprehensive income (loss)	(4,998)	2,435
Comprehensive income (loss)	$ 48,537	$ (718,207)