Condensed Consolidated Statement of Income (Unaudited) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Operating Revenues:
Natural gas sales	$ 26,239	$ 15,706	$ 53,281	$ 43,428
Natural gas transportation	238,069	223,338	478,445	457,653
Natural gas storage	35,043	36,302	71,863	73,490
Other	1,500	1,335	2,618	3,159
Total operating revenues	300,851	276,681	606,207	577,730
Operating Costs and Expenses:
Cost of natural gas sales	26,239	15,706	53,281	43,428
Cost of natural gas transportation	6,982	3,808	18,346	12,337
Operation and maintenance	68,404	62,609	127,839	121,461
Administrative and general	40,479	40,055	83,265	75,171
Depreciation and amortization	66,013	62,502	130,256	124,996
Taxes - other than income taxes	11,863	11,647	25,398	24,155
Other (income) expense, net	3,750	2,570	(6,100)	3,763
Total operating costs and expenses	223,730	198,897	432,285	405,311
Operating Income	77,121	77,784	173,922	172,419
Other (Income) and Other Deductions:
Interest expense	23,873	23,733	47,695	47,280
Interest income - affiliates	(6)	(16)	(16)	(2,178)
Allowance for equity and borrowed funds used during construction (AFUDC)	(4,058)	(3,263)	(9,395)	(5,831)
Equity in earnings of unconsolidated affiliates	(1,095)	(1,525)	(2,413)	(3,066)
Miscellaneous other (income) deductions, net	2,874	78	729	1,314
Total other (income) and other deductions	21,588	19,007	36,600	37,519
Income before Income Taxes	55,533	58,777	137,322	134,900
Provision for Income Taxes	69	105	172	234
Net Income	$ 55,464	$ 58,672	$ 137,150	$ 134,666