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Pension and OPEB - Periodic Cost | 3 Months Ended
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Mar. 31, 2017
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS NET PERIODIC BENEFIT COSTS: [Abstract] |
Components of Pension and Other Postretirement Benefit Plans: | COMPONENTS OF PENSION AND OTHER POST-EMPLOYMENT BENEFIT (OPEB) PLANS NET PERIODIC BENEFIT COSTS: Components of Net Periodic Benefit (Credit) Cost are as follows:
| Pension Benefits |  | Other Post-Employment Benefits
| For the Three Months Ended March 31, |  | For the Three Months Ended March 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service Cost | $ | 846 |  |  | $ | 482 |  |  | $ | — |  |  | $ | — |
Interest Cost | 6,428 |  |  | 6,841 |  |  | 5,986 |  |  | 6,060 |
Expected Return on Plan Assets | (10,596 | ) |  | (11,869 | ) |  | — |  |  | — |
Amortization of Prior Service Credits | (148 | ) |  | (147 | ) |  | (601 | ) |  | — |
Recognized Net Actuarial Loss | 2,351 |  |  | 2,116 |  |  | 5,778 |  |  | 4,792 |
Net Periodic Benefit (Credit) Cost | $ | (1,119 | ) |  | $ | (2,577 | ) |  | $ | 11,163 |  |  | $ | 10,852 |

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- Definition PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS NET PERIODIC BENEFIT COSTS: [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 + Details
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