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BENEFIT PLANS | 9 Months Ended
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Sep. 30, 2016
BENEFIT PLANS [Abstract] |
BENEFIT PLANS | NOTE H: BENEFIT PLANS The Company provides a qualified defined benefit pension to eligible employees and retirees, other post-retirement health and life insurance benefits to certain retirees, an unfunded supplemental pension plan for certain key executives, and an unfunded stock balance plan for certain of its nonemployee directors. The Company accrues for the estimated cost of these benefits through charges to expense during the years that employees earn these benefits. No contributions to the defined benefit pension plan are required or planned for 2016. The net periodic benefit cost for the three and nine months ended September 30, 2016 and 2015 is as follows:
|  | Pension Benefits |  |  | Post-retirement Benefits |
|  | Three Months Ended |  |  | Nine Months Ended |  |  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |  |  | September 30, |  |  | September 30, |
(000's omitted) |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Service cost |  | $ | 1,027 |  |  | $ | 831 |  |  | $ | 3,079 |  |  | $ | 2,493 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |
Interest cost |  |  | 1,406 |  |  |  | 1,375 |  |  |  | 4,218 |  |  |  | 4,124 |  |  |  | 20 |  |  |  | 22 |  |  |  | 61 |  |  |  | 65 |
Expected return on plan assets |  |  | (2,961 | ) |  |  | (3,042 | ) |  |  | (8,882 | ) |  |  | (9,127 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Amortization of unrecognized net loss/(gain) |  |  | 377 |  |  |  | 366 |  |  |  | 1,131 |  |  |  | 1,099 |  |  |  | (1 | ) |  |  | (3 | ) |  |  | (4 | ) |  |  | (10 | )
Amortization of prior service cost/(credit) |  |  | 11 |  |  |  | 2 |  |  |  | 33 |  |  |  | 6 |  |  |  | (45 | ) |  |  | (45 | ) |  |  | (134 | ) |  |  | (134 | )
Net periodic benefit cost |  | $ | (140 | ) |  | $ | (468 | ) |  | $ | (421 | ) |  | $ | (1,405 | ) |  | $ | (26 | ) |  | $ | (26 | ) |  | $ | (77 | ) |  | $ | (79 | )

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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=65877416&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=65897934&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=66047640&loc=d3e39622-114963 + Details
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