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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2017
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 June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 735 |  |  | $ | 4,439 |  |  | $ | 1,469 |  |  | $ | 8,869 |
Interest cost | 5,542 |  |  | 6,018 |  |  | 11,074 |  |  | 12,029 |
Expected return on plan assets | (8,626 | ) |  | (8,894 | ) |  | (17,241 | ) |  | (17,758 | )
Amortization of prior service cost | 4 |  |  | (99 | ) |  | 8 |  |  | (198 | )
Amortization of net loss (1) | 1,011 |  |  | 3,648 |  |  | 2,011 |  |  | 6,314 |
Defined benefit plans | (1,334 | ) |  | 5,112 |  |  | (2,679 | ) |  | 9,256 |
Multi-employer plans | 224 |  |  | 193 |  |  | 417 |  |  | 395 |
Defined contribution plans | 5,804 |  |  | 2,192 |  |  | 12,568 |  |  | 4,161 |
Total pension cost (2) | $ | 4,694 |  |  | $ | 7,497 |  |  | $ | 10,306 |  |  | $ | 13,812 |
(1) The amortization of net loss includes a $959 charge resulting from the deconsolidation of the Venezuelan subsidiary during the three and six months ended June 30, 2016. (2) The decrease for the three and six months ended June 30, 2017 as compared to the prior year periods reflect lower service cost and lower amortization of net losses related to the defined benefit plan freeze effective December 31, 2016, partially offset by higher defined contribution plan expense related to the Company's amended U.S. defined contribution plan that was effective January 1, 2017.

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