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BENEFIT PLANS (Tables) | 9 Months Ended
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Sep. 30, 2015
BENEFIT PLANS [Abstract] |
Net Periodic Benefit Cost | The net periodic benefit cost for the three and nine months ended September 30, 2015 and 2014 is as follows:
|  | Pension Benefits |  |  | Post-retirement Benefits |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |  |  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
(000's omitted) |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Service cost |  | $ | 831 |  |  | $ | 882 |  |  | $ | 2,493 |  |  | $ | 2,647 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |
Interest cost |  |  | 1,375 |  |  |  | 1,318 |  |  |  | 4,124 |  |  |  | 3,953 |  |  |  | 22 |  |  |  | 26 |  |  |  | 65 |  |  |  | 76 |
Expected return on plan assets |  |  | (3,042 | ) |  |  | (2,980 | ) |  |  | (9,127 | ) |  |  | (8,941 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Amortization of unrecognized net loss |  |  | 366 |  |  |  | (77 | ) |  |  | 1,099 |  |  |  | (230 | ) |  |  | (3 | ) |  |  | (2 | ) |  |  | (10 | ) |  |  | (5 | )
Amortization of prior service cost |  |  | 2 |  |  |  | 1 |  |  |  | 6 |  |  |  | 4 |  |  |  | (45 | ) |  |  | (45 | ) |  |  | (134 | ) |  |  | (134 | )
Net periodic benefit income |  | $ | (468 | ) |  | $ | (856 | ) |  | $ | (1,405 | ) |  | $ | (2,567 | ) |  | $ | (26 | ) |  | $ | (21 | ) |  | $ | (79 | ) |  | $ | (63 | )

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- References No definition available. + 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=58740216&loc=d3e1928-114920 + Details
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