Statement of Net Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING REVENUES:
Natural gas transportation	$ 109,883	$ 108,865
Natural gas storage	4,242	3,045
Other	(61)	16
Total operating revenue	114,064	111,926
OPERATING EXPENSES:
General and administrative	12,720	12,733
Operation and maintenance	16,315	15,168
Depreciation and Amortization	26,777	26,329
Regulatory debits	180	939
Taxes, other than income taxes	3,398	4,661
Regulatory charges resulting from tax rate changes	5,814	5,814
Other expense, net	131	315
Total operating expenses	65,335	65,959
OPERATING INCOME	48,729	45,967
OTHER (INCOME) AND OTHER EXPENSES:
Interest expense	7,184	8,064
Allowance for equity and borrowed funds used during construction (AFUDC)	(506)	(411)
Miscellaneous other (income) expenses, net	(936)	(481)
Total other (income) and other expenses	5,742	7,172
NET INCOME	$ 42,987	$ 38,795