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INCOME TAXES (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current income taxes      
Federal $ (9,531,000) $ 41,246,000 $ 35,633,000
State 1,812,000 1,798,000 1,706,000
Total current income taxes from continuing operations (7,719,000) 43,044,000 37,339,000
Deferred income taxes      
Federal 156,818,000 134,208,000 114,333,000
State 16,981,000 3,506,000 9,829,000
Total deferred income taxes from continuing operations 173,799,000 137,714,000 124,162,000
Total provision for income taxes from continuing operations 166,080,000 180,758,000 161,501,000
Discontinued operations (2,698,000) 43,186,000 65,802,000
Total provision for income taxes 163,382,000 223,944,000 227,303,000
Reconciliation for income tax provision [Abstract]      
Income from continuing operations before income taxes 755,170,000 858,506,000 806,410,000
Less: Net income attributable to noncontrolling interests 310,428,000 382,911,000 399,150,000
Income from continuing operations attributable to ONEOK before income taxes 444,742,000 475,595,000 407,260,000
Federal statutory income tax rate 35.00% 35.00% 35.00%
Provision for federal income taxes 155,660,000 166,458,000 142,541,000
State income taxes, net of federal tax benefit 12,102,000 7,908,000 13,860,000
Other, net (1,682,000) 6,392,000 5,100,000
Total provision for income taxes from continuing operations 166,080,000 180,758,000 161,501,000
Deferred tax assets      
Employee benefits and other accrued liabilities 26,161,000 21,518,000  
Federal net operating loss 12,484,000 0  
State net operating loss and benefits 38,322,000 31,990,000  
Other comprehensive income 74,847,000 138,826,000  
Other 7,582,000 5,979,000  
Total deferred tax assets 159,396,000 198,313,000  
Deferred tax liabilities      
Excess of tax over book depreciation and depletion 60,725,000 77,980,000  
Investment in partnerships 1,217,605,000 969,347,000  
Regulatory assets 2,625,000 3,565,000  
Total deferred tax liabilities 1,280,955,000 1,050,892,000  
Deferred Tax Liabilities, Net 1,121,559,000 852,579,000  
Income taxes receivable 24,700,000    
Accrued Income Taxes   14,500,000  
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Operating Activities $ 35,900,000 $ 11,000,000