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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2012
Employee Benefits |
Schedule of asset allocation targets and actual investment composition within the Plans |
|  |  |  | Actual Composition of Plans at December 31,
|  | Target Allocations |  |  | 2012 |  | 2011 |
Domestic large cap equity |  | 29-40% |  |  | 31-42% |  | 29-40% |
Domestic small and mid-cap equity |  | 7-10% |  |  | 9-12% |  | 11-13% |
International equity |  | 11-16% |  |  | 11-13% |  | 10-15% |
Fixed income |  | 25-42% |  |  | 20-37% |  | 23-40% |
Alternative investments |  | 6-8% |  |  | 8-10% |  | 6-7% |
Cash and cash equivalents |  | 1-5% |  |  | 3-4% |  | 2-4% |
Schedule of Plans' assets measured at fair value |
|  | Balance |  |  |  |  |  |  |
|  | December 31, |  |  |  |  |  |  |
(Thousands of dollars) |  | 2012 |  | Level 1 |  | Level 2 |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |
Domestic equity securities |  | $ 36,346 |  | $ 36,346 |  | $ | - |  | $ | - |
Fixed income mutual funds |  | 12,533 |  | 12,533 |  | - |  | - |
Foreign equity securities |  | 7,475 |  | 7,475 |  | - |  | - |
Corporate bonds |  | 6,387 |  | - |  | 6,387 |  | - |
Money market funds |  | 6,285 |  | 6,285 |  | - |  | - |
U.S. Government agency securities |  | 6,218 |  | - |  | 6,218 |  | - |
U.S. Government bonds |  | 5,680 |  | - |  | 5,680 |  | - |
Emerging markets-equity |  | 5,607 |  | 5,607 |  | - |  | - |
Real estate mutual fund |  | 5,453 |  | 5,453 |  | - |  | - |
Mutual funds-equities |  | 2,701 |  | 2,701 |  | - |  | - |
Treasury inflation indexed bonds |  | 2,083 |  | - |  | 2,083 |  | - |
Other |  | 818 |  | - |  | 818 |  | - |
Total Assets |  | $ 97,586 |  | $ 76,400 |  | $ | 21,186 |  | $ | - |
|  | Balance |  |  |  |  |  |  |
|  | December 31, |  |  |  |  |  |  |
(Thousands of dollars) |  | 2011 |  | Level 1 |  | Level 2 |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |
Domestic equity securities |  | $ 34,770 |  | $ 34,770 |  | $ | - |  | $ | - |
Corporate bonds |  | 18,526 |  | - |  | 18,526 |  | - |
Foreign equity securities |  | 7,107 |  | 7,107 |  | - |  | - |
Fixed income mutual funds |  | 6,400 |  | 6,400 |  | - |  | - |
Money market funds |  | 6,513 |  | 6,513 |  | - |  | - |
U.S. Treasury STRIPS |  | 3,587 |  | - |  | 3,587 |  | - |
Emerging markets-equity |  | 3,349 |  | 3,349 |  | - |  | - |
Mutual funds-equities |  | 3,485 |  | 3,485 |  | - |  | - |
Real estate mutual fund |  | 2,909 |  | 2,909 |  | - |  | - |
Exchange traded funds-fixed income |  | 1,788 |  | 1,788 |  | - |  | - |
Municipal bonds |  | 2,048 |  | - |  | 2,048 |  | - |
Other |  | 1,030 |  | - |  | 1,030 |  | - |
Total Assets |  | $ 91,512 |  | $ 66,321 |  | $ | 25,191 |  | $ | - |
Schedule of assumptions used in determining pension information for plans |
|  | Years ended December 31, |
|  | 2012 |  | 2011 |  | 2010 |
Weighted-average assumptions |  |  |  |  |  |  |
Discount rate used to determine obligations |  | 2.50-4.15% |  | 3.75-4.70% |  | 4.45-5.65% |
Discount rate used to determine net periodic benefit cost |  | 3.75-4.70% |  | 4.45-5.65% |  | 5.25-6.25% |
Expected return on plan assets |  | 6.50-7.25% |  | 7.00-7.50% |  | 7.25-7.75% |
Long-term rate of increase in compensation levels |  | 4.00% |  | 4.00-5.00% |  | 4.00-5.00% |
Schedule of the funded status |
December 31, |  | 2012 |  | 2011 |
|  | Accumulated |  | Accumulated |
|  | benefits |  | benefits |
(Thousands of dollars) |  | exceed assets |  | exceed assets |
Reconciliation of benefit obligation: |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 204,540 |  | $ | 173,023 |
Service cost |  | 8,843 |  | 7,523 |
Interest cost |  | 8,918 |  | 9,025 |
Actuarial losses |  | 25,749 |  | 19,637 |
Benefits paid |  | (5,872 | ) | (4,668 | )
Plan curtailments |  | (6,136 | ) | - |
Plan settlement |  | (5,532 | ) | - |
Plan amendments |  | (3,785 | ) | - |
Benefit obligation at end of year |  | $ | 226,725 |  | $ | 204,540 |
Reconciliation of fair value of plan assets: |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 91,512 |  | $ | 93,638 |
Actual return on plan assets |  | 9,426 |  | 807 |
Employer contributions |  | 8,052 |  | 1,735 |
Benefits paid |  | (5,872 | ) | (4,668 | )
Plan settlement |  | (5,532 | ) | - |
Fair value of plan assets at end of year |  | $ | 97,586 |  | $ | 91,512 |
Funded status |  | $ | (129,139 | ) | $ | (113,028 | )
Schedule of net periodic cost of benefits of plans |
|  | Years ended December 31, |
(Thousands of dollars) |  | 2012 |  | 2011 |  | 2010 |
Components of net periodic benefit cost: |  |  |  |  |  |  |
Service cost |  | $ | 8,843 |  | $ | 7,550 |  | $ | 6,367 |
Interest cost |  | 8,918 |  | 8,997 |  | 8,712 |
Expected return on plan assets |  | (6,431 | ) | (6,598 | ) | (6,218 | )
Amortization and other |  | 6,748 |  | 4,027 |  | 4,046 |
Settlement |  | 1,796 |  | - |  | - |
Curtailment |  | 1,134 |  | - |  | - |
Net periodic benefit cost |  | $ | 21,008 |  | $ | 13,976 |  | $ | 12,907 |
Schedule of amounts not reflected in net periodic benefit cost and included in accumulated other comprehensive loss (AOCI) before taxes |
(Thousands of dollars) |  | 2012 |  | 2011 |
Accumulated loss, net of gain |  | $ | (91,611 | ) | $ | (81,708 | )
Prior service cost, net of credit |  | (72 | ) | (6,351 | )
Total accumulated other comprehensive loss |  | $ | (91,683 | ) | $ | (88,059 | )
Schedule of amounts in AOCL expected to be recognized as components of net periodic benefit cost in 2013 |
(Thousands of dollars) |  | 2013 |
Accumulated loss, net of gain |  | $ | (6,588 | )
Prior service cost, net of credit |  | 24 |
Estimated net periodic benefit cost |  | $ | (6,564 | )

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