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FINANCIAL DERIVATIVE INSTRUMENTS - Fair Value Carrying Amount (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives designated as hedging instruments |  |
Total derivatives designated as hedging instruments | $ (1,129) | $ 0
Prepaid expenses and other |  |
Derivatives designated as hedging instruments |  |
Commodity swap contracts, asset derivatives | 17 | 0
Other accrued liabilities |  |
Derivatives designated as hedging instruments |  |
Commodity swap contracts, (liability) derivatives | $ (1,146) | $ 0

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