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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] | The following table sets forth the effect of reclassifications from accumulated other comprehensive income (loss) on our Statements of Income for the period indicated:
Details about Accumulated Other Comprehensive |  | Three Months Ended March 31, | Affected Line Item in the
Income (Loss) Components |  | 2015 | 2014 | Statements of Income
|  | (Thousands of dollars) |
Pension and other postretirement benefit plan obligations (a) |  |  |  |
Amortization of net loss |  | $ | 12,565 |  | $ | 8,542 |  |
Amortization of unrecognized prior service cost |  | (373 | ) | (303 | ) |
|  | 12,192 |  | 8,239 |  |
Regulatory adjustments (b) |  | (11,964 | ) | (13,756 | ) |
|  | 228 |  | (5,517 | ) | Income before income taxes
|  | (88 | ) | 2,124 |  | Income tax expense
Total reclassifications for the period |  | $ | 140 |  | $ | (3,393 | ) | Net income
(a) These components of accumulated other comprehensive income (loss) are included in the computation of net periodic benefit cost. See Note 7 for additional detail of our net periodic benefit cost. (b) Regulatory adjustments represent pension and other postretirement benefit costs expected to be recovered through rates and are deferred as part of our regulatory assets. See Note 2 for additional disclosures of regulatory assets and liabilities.

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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