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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net income (loss) $ 134,321 $ 311,963 $ (7,536) $ 649,171
Other comprehensive income (loss), net of tax        
Change in fair value of derivatives, net of tax of $13,898, $17,035, $45,603 and $37,628, respectively (46,530) (57,029) (152,671) (125,973)
Derivative amounts reclassified to net income (loss), net of tax of $(4,840), $1,804, ($322) and $5,981, respectively 21,013 (8,625) 5,849 (20,796)
Change in retirement and other postretirement benefit plan obligations, net of tax of $(1,064), $(736), $(2,128) and $(1,435), respectively 3,561 2,465 7,123 4,806
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $1,064, $1,100, $3,347 and $1,850, respectively (3,561) (3,683) (11,204) (6,194)
Total other comprehensive income (loss), net of tax (25,517) (66,872) (150,903) (148,157)
Comprehensive income (loss) $ 108,804 $ 245,091 $ (158,439) $ 501,014