CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 37,193	$ 248,875
Accounts receivable, net	1,202,951	872,430
Materials and supplies	90,301	60,912
Natural gas and natural gas liquids in storage	342,293	140,034
Commodity imbalances	38,712	60,896
Other current assets	53,008	45,986
Assets of discontinued operations	0	551
Total current assets	1,764,458	1,429,684
Property, plant and equipment
Property, plant and equipment	15,559,667	15,078,497
Accumulated depreciation and amortization	2,861,541	2,507,094
Net property, plant and equipment (Note E)	12,698,126	12,571,403
Investments and other assets
Investments in unconsolidated affiliates (Note N)	1,003,156	958,807
Goodwill and intangible assets (Note F)	993,460	1,005,359
Deferred income taxes (Note M)	205,907	0
Other assets	180,830	162,998
Assets of discontinued operations	0	10,500
Total investments and other assets	2,383,353	2,137,664
Total assets	16,845,937	16,138,751
Current liabilities
Current maturities of long-term debt (Note G)	432,650	410,650
Short-term borrowings (Note G)	614,673	1,110,277
Accounts payable	1,140,571	874,731
Commodity imbalances	164,161	142,646
Accrued interest	135,309	112,514
Other current liabilities	179,971	166,042
Liabilities of discontinued operations	0	19,841
Total current liabilities	2,667,335	2,836,701
Long-term debt, excluding current maturities (Note G)	8,091,629	7,919,996
Deferred income taxes (Note M)	52,697	1,623,822
Other deferred credits	348,924	321,846
Liabilities of discontinued operations	0	7,471
Total deferred credits and other liabilities	401,621	1,953,139
Commitments and contingencies (Note O)
Equity
Preferred stock, $0.01 par value: issued 20,000 shares at December 31, 2017, and no shares at December 31, 2016	0	0
Common stock, $0.01 par value: authorized 1,200,000,000 shares; issued 423,166,234 shares and outstanding 388,703,543 shares at December 31, 2017; authorized 600,000,000 shares; issued 245,811,180 shares and outstanding 210,681,661 shares at December 31, 2016	4,232	2,458
Paid-in capital	6,588,878	1,234,314
Accumulated other comprehensive loss (Note I)	(188,530)	(154,350)
Retained earnings	0	0
Treasury stock, at cost: 34,462,691 shares at December 31, 2017, and 35,129,519 shares at December 31, 2016	(876,713)	(893,677)
Total ONEOK shareholders’ equity	5,527,867	188,745
Noncontrolling interests in consolidated subsidiaries	157,485	3,240,170
Total equity	5,685,352	3,428,915
Total liabilities and equity	$ 16,845,937	$ 16,138,751