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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income $ 392,018 $ 312,316 $ 1,120,333 $ 304,780
Other comprehensive income (loss), net of tax        
Change in fair value of derivatives, net of tax of $39,299, $4,704, $81,134 and $50,307, respectively (131,566) (15,750) (271,622) (168,421)
Derivative amounts reclassified to net income, net of tax of $(19,845), $(3,038), $(42,722) and $(3,360), respectively 66,438 5,361 143,029 11,210
Change in retirement and other postretirement benefit plan obligations, net of tax of $(1,355), $(1,064), $(4,009) and $(3,192), respectively 4,538 3,562 13,423 10,685
Other comprehensive income (loss) of unconsolidated affiliates, net of tax of $(60), $(332), $(1,429) and $3,015, respectively 197 1,112 4,783 (10,092)
Total other comprehensive loss, net of tax (60,393) (5,715) (110,387) (156,618)
Comprehensive income $ 331,625 $ 306,601 $ 1,009,946 $ 148,162