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Defined Benefit Postretirement Plans (Tables) | 3 Months Ended
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Mar. 31, 2016
Defined Benefit Postretirement Plans [Abstract] |
Components of Net Periodic Pension Benefits and Other Benefit Costs | The components of expense for Pension Benefits and Other Benefits are set forth below (in thousands):
| Pension Benefits |  | Other Benefits |
| Three months ended March 31, |  | Three months ended March 31, |
Components of net periodic cost (benefit): | 2016 |  | 2015 |  | 2016 |  | 2015 |
Service cost |  | $ | 560 |  |  | $ | 655 |  |  | $ | 4 |  |  | $ | 4 |
Interest cost |  |  | 1,051 |  |  |  | 998 |  |  |  | 94 |  |  |  | 91 |
Expected return on plan assets |  |  | (1,835 | ) |  |  | (2,150 | ) |  |  | - |  |  |  | - |
Net amortization |  |  | 483 |  |  |  | 546 |  |  |  | 29 |  |  |  | 15 |
Total cost (benefit) |  | $ | 259 |  |  | $ | 49 |  |  | $ | 127 |  |  | $ | 110 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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