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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 115,185	$ (79,836)	$ 116,604	$ (30,598)
Postretirement benefits:
Amortization of prior service cost	92	93	184	185
Amortization of actuarial gain	(12)		(24)
Income tax expense	(20)	(23)	(40)	(46)
Total comprehensive income (loss)	$ 115,245	$ (79,766)	$ 116,724	$ (30,459)

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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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