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MULTI-EMPLOYER WITHDRAWAL LIABILITY (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Estimated future benefit payments |  |
2017 | $ 4.1 |
2018 | 4.1 |
2019 | 4.1 |
2020 | 4.1 |
2021 | 4.1 |
Thereafter | 76.3 |
Total future payments | 96.8 |
Less: amount representing interest | (32.6) |
Present value of remaining withdrawal liability | 64.2 |
Current portion of withdrawal liability | (4.1) | $ (4.1)
Long-term portion of withdrawal liability | 60.1 |
Horizon |  |
Multiemployer withdrawal liability |  |
Quarterly payments to ILA-PRSSA over an estimated period | $ 1.0 |

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