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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 446,906	$ 109,493	$ (313,142)
Other comprehensive loss:
Foreign currency translation	(192)	91	(39)
Unrealized gain on marketable securities, net of tax	1,137	203	1,615
Defined benefit pension obligations, net of tax	(6,322)	(696)	(5,700)
Other comprehensive income	(5,377)	(402)	(4,124)
Comprehensive income (loss)	$ 441,529	$ 109,091	$ (317,266)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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