Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net income		$ 250,972	$ 198,620	$ 611,999	$ 587,434
Other comprehensive income:
Net loss on cash flow hedges(1)	[1]	(3,410)	(1,830)	(16,939)	(5,443)
Reclassification of net loss (gain) on cash flow hedges to income(1)	[1]	388	119	976	(60)
Amortization of prior service credit(2)	[2]	(928)	(928)	(2,784)	(2,751)
Amortization of actuarial loss(2)	[2]	1,798	985	5,393	3,001
Settlement cost(2)	[2]	0	30	0	1,599
Total other comprehensive loss		(2,152)	(1,624)	(13,354)	(3,654)
Comprehensive income		$ 248,820	$ 196,996	$ 598,645	$ 583,780

[1] See Note 8–Derivative Financial Instruments for details of the amount of gain/loss recognized in accumulated other comprehensive loss ("AOCL") for derivative financial instruments and the amount of gain/loss reclassified from AOCL into income.

[2] See Note 6–Employee Benefit Plans for details of the changes in employee benefit plan assets and benefit obligations recognized in AOCL.