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REGULATORY ASSETS AND LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2018
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items] |
SCHEDULE OF REGULATED ASSETS AND LIABILITIES | The table below presents a summary of regulatory assets, net of amortization, and liabilities for the periods indicated:
|  |  |  | December 31, 2018
|  | Remaining Recovery Period |  | Current |  | Noncurrent |  | Total
|  |  |  | (Thousands of dollars)
Under-recovered purchased-gas costs |  | 1 year |  | $ | 25,083 |  |  | $ | — |  |  | $ | 25,083 |
Pension and other postemployment benefit costs |  | See Note 12 |  | 23,384 |  |  | 421,726 |  |  | 445,110 |
Reacquired debt costs |  | 9 years |  | 812 |  |  | 6,487 |  |  | 7,299 |
MGP remediation costs |  | 15 years |  | — |  |  | 7,724 |  |  | 7,724 |
Ad-valorem tax |  | 1 year |  | 1,070 |  |  | — |  |  | 1,070 |
Other |  | 1 to 20 years |  | 4,071 |  |  | 1,542 |  |  | 5,613 |
Total regulatory assets, net of amortization |  |  |  | 54,420 |  |  | 437,479 |  |  | 491,899 |
Federal income tax rate changes (a) |  | See Note 13 |  | (30,934 | ) |  | (520,866 | ) |  | (551,800 | )
Over-recovered purchased-gas costs |  | 1 year |  | (13,668 | ) |  | — |  |  | (13,668 | )
Weather normalization |  | 1 year |  | (3,792 | ) |  | — |  |  | (3,792 | )
Total regulatory liabilities |  |  |  | (48,394 | ) |  | (520,866 | ) |  | (569,260 | )
Net regulatory assets and liabilities |  |  |  | $ | 6,026 |  |  | $ | (83,387 | ) |  | $ | (77,361 | )
(a) See Note 13 for additional information regarding our federal income tax rate changes regulatory liabilities.
|  |  |  | December 31, 2017
|  | Remaining Recovery Period |  | Current |  | Noncurrent |  | Total
|  |  |  | (Thousands of dollars)
Under-recovered purchased-gas costs |  | 1 year |  | $ | 41,238 |  |  | $ | — |  |  | $ | 41,238 |
Pension and other postemployment benefit costs |  | See Note 12 |  | 25,156 |  |  | 387,582 |  |  | 412,738 |
Weather normalization |  | 1 year |  | 17,461 |  |  | — |  |  | 17,461 |
Reacquired debt costs |  | 10 years |  | 812 |  |  | 7,298 |  |  | 8,110 |
MGP remediation costs |  | 15 years |  | — |  |  | 6,104 |  |  | 6,104 |
Other |  | 1 to 21 years |  | 3,513 |  |  | 4,205 |  |  | 7,718 |
Total regulatory assets, net of amortization |  |  |  | 88,180 |  |  | 405,189 |  |  | 493,369 |
Federal income tax rate changes (a) |  | See Note 13 |  | — |  |  | (519,421 | ) |  | (519,421 | )
Over-recovered purchased-gas costs |  | 1 year |  | (9,434 | ) |  | — |  |  | (9,434 | )
Ad-valorem tax |  | 1 year |  | (4 | ) |  | — |  |  | (4 | )
Total regulatory liabilities |  |  |  | (9,438 | ) |  | (519,421 | ) |  | (528,859 | )
Net regulatory assets and liabilities |  |  |  | $ | 78,742 |  |  | $ | (114,232 | ) |  | $ | (35,490 | )

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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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