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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 144,975	$ 1,419
Postretirement benefits:
Actuarial gain (loss)	7	(12)
Amortization of prior service costs	92	92
Income tax expense	(26)	(20)
Total comprehensive income	$ 145,048	$ 1,479

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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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