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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2016
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 March 31,
|  | 2016 |  | 2015
Service cost |  | $ | 4,430 |  |  | $ | 5,422 |
Interest cost |  | 6,011 |  |  | 10,331 |
Expected return on plan assets |  | (8,864 | ) |  | (15,738 | )
Amortization of prior service cost |  | (99 | ) |  | (156 | )
Amortization of net loss |  | 2,666 |  |  | 5,820 |
Defined benefit plans |  | 4,144 |  |  | 5,679 |
Multi-employer plans |  | 202 |  |  | 217 |
Defined contribution plans |  | 1,969 |  |  | 3,016 |
Total pension cost |  | $ | 6,315 |  |  | $ | 8,912 |
The Company voluntarily contributed $20,000 to its defined benefit plans in the United States during the three months ended March 31, 2016. The decrease in components of total pension cost for the defined benefit plans in 2016 was primarily due to the purchase of a group annuity contract in August 2015.

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