Condensed Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Revenues:
Natural gas sales	$ 24,571	$ 10,146
Natural gas transportation	269,577	262,467
Natural gas storage	35,590	35,750
Other	1,324	1,516
Total operating revenues	331,062	309,879
Operating Costs and Expenses:
Cost of natural gas sales	24,571	10,146
Cost of natural gas transportation	10,854	11,383
Operation and maintenance	60,454	63,606
Administrative and general	47,023	46,070
Depreciation and amortization	76,693	65,995
Taxes - other than income taxes	11,626	11,440
Other (income) expense, net	(1,920)	7,781
Total operating costs and expenses	229,301	216,421
Operating Income	101,761	93,458
Other (Income) and Other Expenses:
Interest expense	20,554	23,718
Allowance for equity and borrowed funds used during construction (AFUDC)	(4,830)	(3,511)
Equity in earnings of unconsolidated affiliates	(1,258)	(1,536)
Miscellaneous other (income) expenses, net	(1,680)	4
Total other (income) and other expenses	12,786	18,675
Net Income	88,975	74,783
Equity interest in unrealized gain (loss) on interest rate hedges (includes $79 for 2013 and $37 for 2012 of accumulated other comprehensive income reclassification for realized losses on interest rate hedges)	102	(25)
Comprehensive Income	$ 89,077	$ 74,758