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REGULATORY ASSETS AND LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2018
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:
|  |  |  | June 30, 2018
|  |  |  | Current |  | Noncurrent |  | Total
|  |  |  | (Thousands of dollars)
Under-recovered purchased-gas costs |  |  |  | $ | 6,741 |  |  | $ | — |  |  | $ | 6,741 |
Pension and postemployment benefit costs |  |  |  | 25,109 |  |  | 367,751 |  |  | 392,860 |
Reacquired debt costs |  |  |  | 812 |  |  | 6,892 |  |  | 7,704 |
MGP remediation costs |  |  |  | — |  |  | 7,724 |  |  | 7,724 |
Ad valorem tax |  |  |  | 662 |  |  | — |  |  | 662 |
Other |  |  |  | 6,078 |  |  | 3,197 |  |  | 9,275 |
Total regulatory assets, net of amortization |  |  |  | 39,402 |  |  | 385,564 |  |  | 424,966 |
Federal income tax rate changes (a) |  |  |  | (16,183 | ) |  | (521,717 | ) |  | (537,900 | )
Over-recovered purchased-gas costs |  |  |  | (31,457 | ) |  | — |  |  | (31,457 | )
Weather normalization |  |  |  | (227 | ) |  | — |  |  | (227 | )
Total regulatory liabilities |  |  |  | (47,867 | ) |  | (521,717 | ) |  | (569,584 | )
Net regulatory assets (liabilities) |  |  |  | $ | (8,465 | ) |  | $ | (136,153 | ) |  | $ | (144,618 | )
(a) See Note 10 for additional information regarding our federal income tax rate changes to regulatory liabilities.
|  |  |  | December 31, 2017
|  |  |  | Current |  | Noncurrent |  | Total
|  |  |  | (Thousands of dollars)
Under-recovered purchased-gas costs |  |  |  | $ | 41,238 |  |  | $ | — |  |  | $ | 41,238 |
Pension and postemployment benefit costs |  |  |  | 25,156 |  |  | 387,582 |  |  | 412,738 |
Weather normalization |  |  |  | 17,461 |  |  | — |  |  | 17,461 |
Reacquired debt costs |  |  |  | 812 |  |  | 7,298 |  |  | 8,110 |
MGP remediation costs |  |  |  | — |  |  | 6,104 |  |  | 6,104 |
Other |  |  |  | 3,513 |  |  | 4,205 |  |  | 7,718 |
Total regulatory assets, net of amortization |  |  |  | 88,180 |  |  | 405,189 |  |  | 493,369 |
Federal income tax rate changes (a) |  |  |  | — |  |  | (519,421 | ) |  | (519,421 | )
Over-recovered purchased-gas costs |  |  |  | (9,434 | ) |  | — |  |  | (9,434 | )
Ad valorem tax |  |  |  | (4 | ) |  | — |  |  | (4 | )
Total regulatory liabilities |  |  |  | (9,438 | ) |  | (519,421 | ) |  | (528,859 | )
Net regulatory assets (liabilities) |  |  |  | $ | 78,742 |  |  | $ | (114,232 | ) |  | $ | (35,490 | )
(a) See Note 10 for additional information regarding our federal income tax rate changes to regulatory liabilities.

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- Definition [Line Items] 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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- 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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