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REGULATORY ASSETS AND LIABILITIES (Notes) | 3 Months Ended
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Mar. 31, 2015
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |
Schedule of Regulatory Assets and Liabilities |
2. | REGULATORY ASSETS AND LIABILITIES
The tables below present a summary of regulatory assets, net of amortization, and liabilities for the periods indicated:
|  |  |  | March 31, 2015
|  |  |  | Current |  | Noncurrent |  | Total
|  |  |  | (Thousands of dollars)
Pension and postretirement benefit costs (see Note 7) |  |  |  | $ | 20,218 |  |  | $ | 453,382 |  |  | $ | 473,600 |
Reacquired debt costs |  |  |  | 812 |  |  | 9,527 |  |  | 10,339 |
Other |  |  |  | 1,292 |  |  | 2,140 |  |  | 3,432 |
Total regulatory assets, net of amortization |  |  |  | 22,322 |  |  | 465,049 |  |  | 487,371 |
Accumulated removal costs (a) |  |  |  | — |  |  | (15,038 | ) |  | (15,038 | )
Weather normalization |  |  |  | (8,740 | ) |  | — |  |  | (8,740 | )
Over-recovered purchased-gas costs |  |  |  | (44,015 | ) |  | — |  |  | (44,015 | )
Ad valorem tax |  |  |  | (1,497 | ) |  | — |  |  | (1,497 | )
Total regulatory liabilities |  |  |  | (54,252 | ) |  | (15,038 | ) |  | (69,290 | )
Net regulatory assets (liabilities) |  |  |  | $ | (31,930 | ) |  | $ | 450,011 |  |  | $ | 418,081 |
(a) Included in other deferred credits in our Balance Sheets.
|  |  |  | December 31, 2014
|  |  |  | Current |  | Noncurrent |  | Total
|  |  |  | (Thousands of dollars)
Under-recovered purchased-gas costs |  |  |  | $ | 28,712 |  |  | $ | — |  |  | $ | 28,712 |
Pension and postretirement benefit costs |  |  |  | 18,108 |  |  | 466,684 |  |  | 484,792 |
Reacquired debt costs |  |  |  | 812 |  |  | 9,730 |  |  | 10,542 |
Other |  |  |  | 2,561 |  |  | 2,309 |  |  | 4,870 |
Total regulatory assets, net of amortization |  |  |  | 50,193 |  |  | 478,723 |  |  | 528,916 |
Accumulated removal costs (a) |  |  |  | — |  |  | (15,451 | ) |  | (15,451 | )
Weather normalization |  |  |  | (16,516 | ) |  | — |  |  | (16,516 | )
Over-recovered purchased-gas costs |  |  |  | (13,055 | ) |  | — |  |  | (13,055 | )
Ad valorem tax |  |  |  | (2,896 | ) |  | — |  |  | (2,896 | )
Total regulatory liabilities |  |  |  | (32,467 | ) |  | (15,451 | ) |  | (47,918 | )
Net regulatory assets (liabilities) |  |  |  | $ | 17,726 |  |  | $ | 463,272 |  |  | $ | 480,998 |
(a) Included in other deferred credits in our Balance Sheets. Regulatory assets on our Balance Sheets, as authorized by the various regulatory commissions, are probable of recovery. Base rates are designed to provide a recovery of costs during the period rates are in effect, but do not generally provide for a return on investment for amounts we have deferred as regulatory assets. All of our regulatory assets recoverable through base rates are subject to review by the respective regulatory authorities during future rate proceedings. We are not aware of any evidence that these costs will not be recoverable through either riders or base rates, and we believe that we will be able to recover such costs, consistent with our historical recoveries. Purchased-gas costs include the costs that have been over- or under-recovered from customers through the purchased-gas cost adjustment mechanisms and also include natural gas utilized in our operations, premiums paid and any cash settlements received from our purchased natural gas call options.

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- Definition The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit. + References No definition available. + Details
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