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EMPLOYEE BENEFIT PLAN (Details) - Multiple Employers Retirement Income Plan - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Employee benefit plan |  |  |  |
Interest cost | $ 490,000 | $ 458,000 | $ 1,470,000 | $ 1,374,000
Expected return on plan assets | (649,000) | (710,000) | (1,949,000) | (2,128,000)
Amortization of net losses | 229,000 | 206,000 | 689,000 | 618,000
Net periodic benefit cost (credit) | $ 70,000 | $ (46,000) | $ 210,000 | (136,000)
Employer contributions |  |  |  | $ 5,000,000

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