Condensed Consolidated Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Revenues:
Natural gas sales	$ 16,293	$ 21,407
Natural gas transportation	358,168	322,560
Natural gas storage	19,922	35,145
Other	1,483	911
Total operating revenues	395,866	380,023
Operating Costs and Expenses:
Cost of natural gas sales	16,293	21,407
Cost of natural gas transportation	6,071	12,895
Operation and maintenance	68,223	68,283
Administrative and general	47,527	46,959
Depreciation and amortization	77,685	66,305
Taxes - other than income taxes	15,401	12,541
Other expense, net	11,491	17,815
Total operating costs and expenses	242,691	246,205
Operating Income	153,175	133,818
Other (Income) and Other Expenses:
Interest expense	38,822	20,807
Allowance for equity and borrowed funds used during construction (AFUDC)	(10,273)	(14,652)
Equity in earnings of unconsolidated affiliates	(1,560)	(1,519)
Miscellaneous other (income) expenses, net	1,468	364
Total other (income) and other expenses	28,457	5,000
Net Income	124,718	128,818
Other comprehensive income (loss):
Equity interest in unrealized gain (loss) on interest rate hedges (includes $53 for 2016 and $84 for 2015 of accumulated other comprehensive income reclassification for equity interest in realized losses on interest rate hedges)	(234)	(53)
Comprehensive Income	$ 124,484	$ 128,765