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EMPLOYEE BENEFIT PLAN (Details) - Multiple Employers Retirement Income Plan - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Employee benefit plan |  |  |  |
Interest cost | $ 490,000 | $ 458,000 | $ 980,000 | $ 916,000
Expected return on plan assets | (650,000) | (709,000) | (1,300,000) | (1,418,000)
Amortization of net losses | 230,000 | 206,000 | 460,000 | 412,000
Net periodic benefit cost (credit) | $ 70,000 | $ (45,000) | $ 140,000 | (90,000)
Employer contributions |  |  |  | $ 5,000,000

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