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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [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 $1.7 million to the pension plans during the six months ended June 30, 2018, and expects to contribute approximately $3.7 million to the pension plans during the remainder of 2018. 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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 141 |  |  | $ | 128 |  |  | $ | 278 |  |  | $ | 353 |
Interest cost | 1,098 |  |  | 1,163 |  |  | 2,181 |  |  | 2,334 |
Expected return on assets | (1,491 | ) |  | (1,368 | ) |  | (2,983 | ) |  | (2,737 | )
Amortization of unrecognized prior service cost | 50 |  |  | 34 |  |  | 100 |  |  | 68 |
Amortization of net unrecognized loss | 690 |  |  | 655 |  |  | 1,366 |  |  | 1,329 |
Net periodic pension cost | $ | 488 |  |  | $ | 612 |  |  | $ | 942 |  |  | $ | 1,347 |
Service cost is recorded as cost of sales in the Condensed Consolidated Statement of Operations while all other components are recorded in other income.

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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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