Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES:
Net income	$ 47,121	$ 46,408
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	25,315	25,081
Regulatory debits	849	598
Amortization of deferred charges and credits	(165)	336
Allowance for equity funds used during construction	(262)	(95)
Changes in current assets and liabilities:
Trade and other accounts receivable	1,061	1,975
Affiliated receivables	(261)	662
Exchange gas due from others	771	1,786
Materials and supplies	(26)	(60)
Other current assets	1,495	(201)
Trade accounts payable	(2,062)	(1,693)
Affiliated payables	(1,308)	(2,937)
Exchange gas due to others	(771)	(1,772)
Other accrued liabilities	12,285	14,269
Changes in noncurrent assets and liabilities:
Deferred charges	(1,341)	(495)
Noncurrent liabilities	2,650	2,883
Net cash provided by operating activities	85,351	86,745
FINANCING ACTIVITIES:
Cash distributions to parent	(57,000)	(58,000)
Other	0	(1,097)
Net cash used in financing activities	(57,000)	(59,097)
Property, plant and equipment:
Capital expenditures, net of equity AFUDC	(12,327)	(10,360)
Contributions and advances for construction costs	379	751
Disposal of property, plant and equipment, net	(66)	(548)
Advances to affiliates, net	(26,154)	(17,066)
Proceeds from insurance	9,776	0
Net cash used in investing activities	(28,392)	(27,223)
NET INCREASE (DECREASE) IN CASH	(41)	425
CASH AT BEGINNING OF PERIOD	169	154
CASH AT END OF PERIOD	128	579
Increases to property, plant and equipment	(5,759)	(11,045)
Changes in related in accounts receivable, accounts payable, and accrued liabilities	(6,568)	685
Capital expenditures, net of equity AFUDC	$ (12,327)	$ (10,360)