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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (PARANTHETICAL) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Change in fair value of derivatives, tax	$ 17,035	$ 6,054	$ 37,628	$ (4,258)
Derivative amounts reclassified to net income, tax	1,804	(3,631)	5,981	(7,209)
Change in retirement and other postretirement benefit plan obligations, tax	(736)	(967)	(1,435)	(1,748)
Other comprehensive income (loss) on investments in unconsolidated affiliates, tax	$ 1,100	$ (292)	$ 1,850	$ (1,136)

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

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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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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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