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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2014
Employee Benefits |
Schedule of Plans' assets measured at estimated fair value |
|  | Balance |  |  |  |  |  |  |
|  | December 31, |  |  |  |  |  |  |
(Thousands of dollars) |  | 2014 |  | Level 1 |  | Level 2 |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |
Domestic equity securities |  | $ 66,618 |  | $ 66,618 |  | $ | - |  | $ | - |
Foreign equity securities |  | 27,945 |  | 27,945 |  | - |  | - |
Real estate mutual fund |  | 8,977 |  | 8,977 |  | - |  | - |
Fixed income mutual funds |  | 4,683 |  | 4,683 |  | - |  | - |
Commodity mutual funds |  | 3,831 |  | 3,831 |  | - |  | - |
International fixed income mutual funds |  | 2,808 |  | 2,808 |  | - |  | - |
Money market funds |  | 2,205 |  | 2,205 |  | - |  | - |
Other |  | 5,037 |  | 174 |  | 4,863 |  | - |
Total Assets |  | $ 122,104 |  | $ 117,241 |  | $ | 4,863 |  | $ | - |
|  | Balance |  |  |  |  |  |  |
|  | December 31, |  |  |  |  |  |  |
(Thousands of dollars) |  | 2013 |  | Level 1 |  | Level 2 |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |
Domestic equity securities |  | $ 65,998 |  | $ 65,998 |  | $ | - |  | $ | - |
Foreign equity securities |  | 30,348 |  | 30,348 |  | - |  | - |
Real estate mutual fund |  | 8,866 |  | 8,866 |  | - |  | - |
Commodity mutual funds |  | 2,756 |  | 2,756 |  | - |  | - |
International fixed income mutual funds |  | 2,485 |  | 2,485 |  | - |  | - |
Money market funds |  | 1,938 |  | 1,938 |  | - |  | - |
Fixed income mutual funds |  | 1,786 |  | 1,786 |  | - |  | - |
Corporate bonds |  | 1,528 |  | - |  | 1,528 |  | - |
Other |  | 3,850 |  | - |  | 3,850 |  | - |
Total Assets |  | $ 119,555 |  | $ 114,177 |  | $ | 5,378 |  | $ | - |
Schedule of assumptions used in determining pension information for plans |
|  | Years ended December 31, |
|  | 2014 |  | 2013 |  | 2012 |
Weighted-average assumptions |  |  |  |  |  |  |
Discount rate used to determine obligations |  | 3.15-4.40% |  | 3.55-5.20% |  | 2.50-4.15% |
Discount rate used to determine net periodic benefit cost |  | 3.55-5.20% |  | 2.50-4.15% |  | 3.75-4.70% |
Expected return on plan assets |  | 7.00-8.00% |  | 6.50-7.25% |  | 6.50-7.25% |
Long-term rate of increase in compensation levels |  | 4.00% |  | 4.00% |  | 4.00% |
Schedule of the funded status |
|  | December 31, |
(Thousands of dollars) |  | 2014 |  | 2013 |
Reconciliation of benefit obligation: |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 203,263 |  | $ | 226,725 |
Service cost |  | 7,701 |  | 9,427 |
Interest cost |  | 9,627 |  | 8,199 |
Actuarial losses (gains) |  | 44,322 |  | (30,968 | )
Benefits paid |  | (6,699 | ) | (6,916 | )
Plan settlement |  | (638 | ) | - |
Agreement termination gain |  | - |  | (3,204 | )
Benefit obligation at end of year |  | $ | 257,576 |  | $ | 203,263 |
Reconciliation of fair value of plan assets: |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 119,555 |  | $ | 97,586 |
Actual return on plan assets |  | 6,473 |  | 15,494 |
Employer contributions |  | 3,413 |  | 13,391 |
Benefits paid |  | (6,699 | ) | (6,916 | )
Plan settlement |  | (638 | ) | - |
Fair value of plan assets at end of year |  | $ | 122,104 |  | $ | 119,555 |
Funded status |  | $ | (135,472 | ) | $ | (83,708 | )
Schedule of net periodic benefits cost of plans |
|  | Years ended December 31, |
(Thousands of dollars) |  | 2014 |  | 2013 |  | 2012 |
Components of net periodic benefit cost: |  |  |  |  |  |  |
Service cost |  | $ | 7,701 |  | $ | 9,427 |  | $ | 8,843 |
Interest cost |  | 9,627 |  | 8,199 |  | 8,918 |
Expected return on plan assets |  | (8,695 | ) | (6,458 | ) | (6,431 | )
Amortization and other |  | 2,075 |  | 6,303 |  | 6,748 |
Agreement termination gain |  | - |  | (3,204 | ) | - |
Settlement |  | 156 |  | - |  | 1,796 |
Curtailment |  | - |  | - |  | 1,134 |
Net periodic benefit cost |  | $ | 10,864 |  | $ | 14,267 |  | $ | 21,008 |

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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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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