STATEMENT OF CHANGES IN EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]	Owner's Net Investment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Equity, beginning balance at Dec. 31, 2011	$ 1,158,355	$ 0	$ 0	$ 0	$ 1,158,355	$ 0
Shares Issued, beginning balance at Dec. 31, 2011		0
Net income	96,509	0	0	0	96,509	0
Distributions to ONEOK	(100,067)	0	0	0	(100,067)	0
Other comprehensive loss	0
Equity, ending balance at Dec. 31, 2012	1,154,797	0	0	0	1,154,797	0
Shares Issued, ending balance at Dec. 31, 2012		0
Net income	99,195	0	0	0	99,195	0
Distributions to ONEOK	(14,969)	0	0	0	(14,969)	0
Other comprehensive loss	0
Common stock issued, shares		100
Common stock issued, value	0	0	0	0	0	0
Equity, ending balance at Dec. 31, 2013	1,239,023	0	0	0	1,239,023	0
Shares Issued, ending balance at Dec. 31, 2013		100
Net income	109,790	0	0	84,214	25,576	0
Other comprehensive loss	(1,781)	0	0	0	0	(1,781)
Net transfers from ONEOK	481,086	0	0	0	484,479	(3,393)
Reclassification of Owner's investment to paid-in capital	0	0	1,749,078	0	(1,749,078)	0
Net issuance of common stock at the separation, Shares		51,941,136
Common stock issued, shares		142,623
Issuance of common stock at the separation, value	0	520	(520)	0	0	0
Common stock issued, value	9,615	1	9,614	0	0	0
Equity, ending balance at Dec. 31, 2014	1,794,037	521	1,758,796	39,894	0	(5,174)
Common stock dividends - $0.84 per share at Dec. 31, 2014	$ (43,696)	$ 0	$ 624	$ (44,320)	$ 0	$ 0
Shares Issued, ending balance at Dec. 31, 2014		52,083,859