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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income (loss) $ 386,176 $ (141,857)
Other comprehensive income (loss), net of tax    
Change in fair value of derivatives, net of tax of $(9,857) and $31,705, respectively 32,998 (106,141)
Derivative amounts reclassified to net income (loss), net of tax of $(12,361) and $4,518, respectively 41,387 (15,164)
Change in retirement and other postretirement benefit plan obligations, net of tax of $(1,087) and $(1,064), respectively 3,638 3,562
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $(2,339) and $2,283, respectively 7,830 (7,643)
Total other comprehensive income (loss), net of tax 85,853 (125,386)
Comprehensive income (loss) $ 472,029 $ (267,243)