Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 287,564	$ 207,663
Other comprehensive income (loss):
Net loss on cash flow hedges	(11,914)	(4,376)
Reclassification of net loss on cash flow hedges to income	809	627
Net actuarial loss	(747)	0
Curtailment gain	1,703	0
Recognition of prior service credit amortization in income	(45)	(45)
Recognition of actuarial loss amortization in income	1,531	1,348
Recognition of settlement cost in income	969	0
Total other comprehensive income (loss)	(7,694)	(2,446)
Comprehensive income	$ 279,870	$ 205,217