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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in fair value of derivatives, tax	$ 49,292	$ 44,149	$ 1,694
Derivative amounts reclassified to net income, tax	6,313	(6,058)	11,013
Change in retirement and other postretirement benefit plan obligations, tax	7,812	2,910	(1,425)
Other comprehensive income (loss) of unconsolidated affiliates, tax	$ (2,201)	$ (2,152)	$ 724

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Other Comprehensive Income (Loss), Portion Attributable to Equity Method Investments, Tax

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount, after reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income of defined benefit plan.

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