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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net income (loss) $ 342,139 $ 134,321 $ 728,315 $ (7,536)
Other comprehensive income (loss), net of tax        
Change in fair value of derivatives, net of tax of $51,692, $13,898, $41,835 and $45,603, respectively (173,054) (46,530) (140,056) (152,671)
Derivative amounts reclassified to net income (loss), net of tax of $(10,516), $(4,840), $(22,877) and $(322), respectively 35,204 21,013 76,591 5,849
Change in retirement and other postretirement benefit plan obligations, net of tax of $(1,567), $(1,064), $(2,654) and $(2,128), respectively 5,247 3,561 8,885 7,123
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $970, $1,064, $(1,369) and $3,347, respectively (3,244) (3,561) 4,586 (11,204)
Total other comprehensive loss, net of tax (135,847) (25,517) (49,994) (150,903)
Comprehensive income (loss) $ 206,292 $ 108,804 $ 678,321 $ (158,439)