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REGULATORY ASSETS AND LIABILITIES (Tables) | 3 Months Ended
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Mar. 31, 2015
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |
SCHEDULE OF REGULATED 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.

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- Definition [Table Text Block] for Tabular disclosure of assets and liabilities that result from rate actions of a regulator. Regulatory assets are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References No definition available. + Details
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