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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 5,081 |  |  | $ | 5,744 |  |  | $ | 10,144 |  |  | $ | 11,419 |
Interest cost | 10,615 |  |  | 9,508 |  |  | 21,277 |  |  | 18,898 |
Expected return on plan assets | (17,048 | ) |  | (15,860 | ) |  | (34,069 | ) |  | (31,264 | )
Amortization of prior service cost | (152 | ) |  | (153 | ) |  | (307 | ) |  | (306 | )
Amortization of net loss | 4,209 |  |  | 8,106 |  |  | 8,431 |  |  | 16,217 |
Defined benefit plans | 2,705 |  |  | 7,345 |  |  | 5,476 |  |  | 14,964 |
Multi-employer plans | 267 |  |  | 226 |  |  | 531 |  |  | 465 |
Defined contribution plans | 2,819 |  |  | 2,603 |  |  | 5,653 |  |  | 5,192 |
Total pension cost | $ | 5,791 |  |  | $ | 10,174 |  |  | $ | 11,660 |  |  | $ | 20,621 |
The Company voluntarily contributed $20,000 to its defined benefit plans in the United States during the six months ended June 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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