Condensed Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Revenues:
Natural gas sales	$ 27,568	$ 24,571
Natural gas transportation	300,381	269,577
Natural gas storage	36,595	35,590
Other	1,118	1,324
Total operating revenues	365,662	331,062
Operating Costs and Expenses:
Cost of natural gas sales	27,568	24,571
Cost of natural gas transportation	11,203	10,854
Operation and maintenance	60,433	60,454
Administrative and general	47,134	47,023
Depreciation and amortization	69,909	67,693
Taxes - other than income taxes	12,282	11,626
Other expense, net	7,451	7,080
Total operating costs and expenses	235,980	229,301
Operating Income	129,682	101,761
Other (Income) and Other Expenses:
Interest expense	21,959	20,554
Allowance for equity and borrowed funds used during construction (AFUDC)	(2,982)	(4,830)
Equity in earnings of unconsolidated affiliates	(1,477)	(1,258)
Miscellaneous other (income) expenses, net	402	(1,680)
Total other (income) and other expenses	17,902	12,786
Net Income	111,780	88,975
Other comprehensive income (loss):
Equity interest in unrealized gain (loss) on interest rate hedges (includes $84 for 2014 and $79 for 2013 of accumulated other comprehensive income reclassification for realized losses on interest rate hedges)	38	102
Comprehensive Income	$ 111,818	$ 89,077