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DERIVATIVE FINANCIAL INSTRUMENTS (Details) lb in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 30, 2019 USD ($) lb | Dec. 31, 2018 USD ($) | Dec. 31, 2017 lb | Mar. 08, 2018 USD ($)
Interest Rate Swap, Through December 2021 |  |  |  |
Derivative Financial Instruments |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent | $ (700,000) | $ 200,000 |  |
Interest Rate Swap, Through December 2021 | Derivative contracts designated as hedging instruments |  |  |  |
Derivative Financial Instruments |  |  |  |
Aggregate notional amount | 256,800,000 |  |  | $ 260,000,000
Long-term liability to recognize fair value of swaps | $ 1,000,000 |  |  |
Long-term asset to recognize fair value of swaps |  | 200,000 |  |
Interest Rate Swap, Through December 2021 | Derivative contracts designated as hedging instruments | Term loan |  |  |  |
Derivative Financial Instruments |  |  |  |
Fixed rate (percentage) | 2.535% |  |  |
FX Forward Contracts |  |  |  |
Derivative Financial Instruments |  |  |  |
Aggregate notional amount | $ 20,200,000 | 14,400,000 |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent | 0 | 0 |  |
FX embedded derivatives | Derivative contracts not designated as hedging instruments |  |  |  |
Derivative Financial Instruments |  |  |  |
Aggregate notional amount | 400,000 | 400,000 |  |
Commodity Contracts |  |  |  |
Derivative Financial Instruments |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent | 200,000 | (800,000) |  |
Fair value of derivative contract - asset | $ 300,000 |  |  |
Fair value of derivative contract - liability |  | $ 1,000,000 |  |
Commodity Contracts | Derivative contracts designated as hedging instruments |  |  |  |
Derivative Financial Instruments |  |  |  |
Notional amount of commodity contracts (in pounds of copper) | lb | 3.2 |  | 3.9 |

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