BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, plant and equipment
Property, plant and equipment	$ 4,704,681	$ 4,534,074
Accumulated depreciation and amortization	1,530,201	1,489,216
Net property, plant and equipment	3,174,480	3,044,858
Current assets
Cash and cash equivalents	161,326	3,171
Accounts receivable, net	192,104	356,988
Natural gas in storage	152,045	166,128
Regulatory assets (Note 2)	31,561	21,657
Other current assets	33,892	54,240
Total current assets	570,928	602,184
Goodwill and other assets
Regulatory assets (Note 2)	322,691	23,822
Goodwill	157,953	157,953
Other assets	57,758	17,658
Total goodwill and other assets	538,402	199,433
Total assets	4,283,810	3,846,475
Equity and long-term debt
Preferred stock, $0.01 par value: authorized 50,000,000 shares; no shares issued	0	0
Common stock, $0.01 par value: authorized 250,000,000 shares; issued and outstanding 51,992,547 shares at June 30, 2014; authorized 1,000 shares, issued and outstanding 100 shares at December 31, 2013	520	0
Paid-in Capital	1,754,636	0
Accumulated other comprehensive income (loss)	(3,471)	0
Retained earnings	28,401	0
Owner's net investment	0	1,239,023
Total equity	1,780,086	1,239,023
Long-term debt, excluding current maturities	1,201,314	1,318
Long-term line of credit with ONEOK	0	1,027,631
Total equity and long-term debt	2,981,400	2,267,972
Current liabilities
Current maturities of long-term debt	6	6
Short-term note payable to ONEOK	0	444,960
Affiliate payable	0	22,403
Accounts payable	100,357	169,500
Accrued interest	19,515	129
Accrued taxes other than income	38,641	32,426
Customer deposits	57,066	57,360
Regulatory liabilities, current	17,983	17,796
Other current liabilities	34,794	24,497
Total current liabilities	268,362	769,077
Deferred credits and other liabilities [Abstract]
Deferred income taxes	834,686	743,452
Other deferred credits	199,362	65,974
Total deferred credits and other liabilities	1,034,048	809,426
Commitments and contingencies (Note 7)
Total liabilities and equity	$ 4,283,810	$ 3,846,475