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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS | 9 Months Ended
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Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
RETIREMENT AND POSTRETIREMENT BENEFIT PLANS | RETIREMENT AND POSTRETIREMENT BENEFIT PLANS The components of total pension cost were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 4,228 |  |  | $ | 6,144 |  |  | $ | 14,372 |  |  | $ | 17,563 |
Interest cost | 10,647 |  |  | 8,954 |  |  | 31,924 |  |  | 27,852 |
Expected return on plan assets | (16,940 | ) |  | (14,667 | ) |  | (51,009 | ) |  | (45,931 | )
Amortization of prior service cost | (154 | ) |  | (153 | ) |  | (461 | ) |  | (459 | )
Amortization of net loss | 4,815 |  |  | 7,045 |  |  | 13,246 |  |  | 23,262 |
Settlement/curtailment loss | 1,562 |  |  | — |  |  | 1,562 |  |  | — |
Defined benefit plans | 4,158 |  |  | 7,323 |  |  | 9,634 |  |  | 22,287 |
Multi-employer plans | 250 |  |  | 237 |  |  | 781 |  |  | 702 |
Defined contribution plans | 2,898 |  |  | 2,599 |  |  | 8,551 |  |  | 7,791 |
Total pension cost | $ | 7,306 |  |  | $ | 10,159 |  |  | $ | 18,966 |  |  | $ | 30,780 |
The Company voluntarily contributed $21,175 to its defined benefit plans in the United States during the nine months ended September 30, 2014. The amortization of net loss decreased due to greater actuarial gains during 2013, attributable to a higher discount rate and higher actual return on plan assets compared with the expected return on assets.

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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 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 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=35743120&loc=d3e2410-114920 Reference 3: 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=35742057&loc=SL14450702-114947 Reference 4: 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 Reference 5: 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 + Details
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