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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2013
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,
| 2013 |  | 2012 |  | 2013 |  | 2012
Service cost | $ | 5,744 |  |  | $ | 5,970 |  |  | $ | 11,419 |  |  | $ | 10,849 |
Interest cost | 9,508 |  |  | 10,491 |  |  | 18,898 |  |  | 20,729 |
Expected return on plan assets | (15,860 | ) |  | (14,983 | ) |  | (31,264 | ) |  | (29,371 | )
Amortization of prior service cost | (153 | ) |  | (23 | ) |  | (306 | ) |  | (45 | )
Amortization of net loss | 8,106 |  |  | 7,749 |  |  | 16,217 |  |  | 15,543 |
Defined benefit plans | 7,345 |  |  | 9,204 |  |  | 14,964 |  |  | 17,705 |
Multi-employer plans | 226 |  |  | 225 |  |  | 465 |  |  | 467 |
Defined contribution plans | 2,603 |  |  | 2,353 |  |  | 5,192 |  |  | 4,597 |
Total pension cost | $ | 10,174 |  |  | $ | 11,782 |  |  | $ | 20,621 |  |  | $ | 22,769 |
The Company voluntarily contributed $75,000 to its defined benefit plans in the United States during the six months ended June 30, 2013.

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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 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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