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EMPLOYEE BENEFIT PLANS (Tables) | 3 Months Ended
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Mar. 31, 2015
Employee Benefit Plans [Line Items] |
Schedule of Net Benefit Costs [Table Text Block] | The following tables set forth the components of net periodic benefit cost for our pension and other postretirement benefit plans for the periods indicated:
| Pension Benefits
| Three Months Ended |  | Three Months Ended
| March 31, |  | March 31,
| 2015 |  | 2014
| (Thousands of dollars)
Components of net periodic benefit cost |  |  |
Service cost | $ | 3,524 |  |  | $ | 2,768 |
Interest cost | 10,652 |  |  | 10,948 |
Expected return on assets | (15,362 | ) |  | (14,965 | )
Amortization of unrecognized prior service cost | 67 |  |  | 137 |
Amortization of net loss | 11,055 |  |  | 7,550 |
Net periodic benefit cost | $ | 9,936 |  |  | $ | 6,438 |
| Other Postretirement Benefits
| Three Months Ended |  | Three Months Ended
| March 31, |  | March 31,
| 2015 |  | 2014
| (Thousands of dollars)
Components of net periodic benefit cost |  |  |
Service cost | $ | 849 |  |  | $ | 1,174 |
Interest cost | 2,666 |  |  | 2,901 |
Expected return on assets | (2,908 | ) |  | (2,848 | )
Amortization of unrecognized prior service cost | (440 | ) |  | (440 | )
Amortization of net loss | 1,510 |  |  | 992 |
Net periodic benefit cost | $ | 1,677 |  |  | $ | 1,779 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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