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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | EMPLOYEE BENEFIT PLANS The Company has three frozen defined benefit pension plans covering certain employees or former employees of three U.S. subsidiaries. The Company also has pension plans covering certain employees of several foreign subsidiaries. The Company also sponsors a number of defined contribution plans in the U.S. and at foreign subsidiaries. The Company contributed approximately $1.4 million to the pension plans during the six months ended June 30, 2017, and expects to contribute approximately $1.9 million to the pension plans during the remainder of 2017. The components of net periodic pension cost consisted of the following for the periods set forth below (amounts in thousands):
| Three months ended |  | Six months ended
| June 30, |  | June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 128 |  |  | $ | 206 |  |  | $ | 353 |  |  | $ | 312 |
Interest cost | 1,163 |  |  | 1,233 |  |  | 2,334 |  |  | 2,470 |
Expected return on assets | (1,368 | ) |  | (1,395 | ) |  | (2,737 | ) |  | (2,788 | )
Amortization of unrecognized prior service cost | 34 |  |  | 34 |  |  | 68 |  |  | 68 |
Amortization of net unrecognized loss | 655 |  |  | 762 |  |  | 1,329 |  |  | 1,527 |
Net periodic pension cost | $ | 612 |  |  | $ | 840 |  |  | $ | 1,347 |  |  | $ | 1,589 |

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