Statement of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING EXPENSES:
General and administrative	$ 12,733	$ 14,081
Operation and maintenance	15,168	15,452
Depreciation	26,329	25,461
Regulatory Debits	939	1,247
Taxes, other than income taxes	4,661	4,781
Regulatory charge resulting from tax rate change	5,814	0
Other expense, net	315	0
Total operating expenses	65,959	61,022
OPERATING REVENUES:
Natural gas transportation	108,865	117,333
Natural gas storage	3,045	3,152
Other	16	15
Total operating revenue	111,926	120,500
OPERATING INCOME	45,967	59,478
OTHER (INCOME) AND OTHER EXPENSES:
Interest expense	8,064	8,362
Allowance for equity and borrowed funds used during construction (AFUDC)	(411)	(150)
Miscellaneous other (income) expenses, net	(481)	117
Total other (income) and other expenses	7,172	8,329
NET INCOME	38,795	51,149
CASH FLOW HEDGES:
Amortization of cash flow hedges into Interest expense	0	0
COMPREHENSIVE INCOME	$ 38,795	$ 51,149