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DERIVATIVE FINANCIAL INSTRUMENTS - Commodity Price Risk Management (Details) $ in Thousands, gal in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) gal | Dec. 31, 2016 USD ($) gal
Disclosure of detailed information about financial instruments [line items] |  |
Premiums realized on written foreign exchange call options | $ (2,925) | $ (2,569)
Realized loss on warrants |  | 543
Unrealized loss (gain) on warrants | 15 | (580)
Realized (gain) loss on currency and commodity derivatives | (10,832) | 357
Unrealized gain on currency and commodity derivatives | (7,248) | (7,219)
Gain on derivative financial instruments | $ (20,990) | $ (9,468)
Heating Oil Commodity Derivative |  |
Disclosure of detailed information about financial instruments [line items] |  |
Derivative financial instruments outstanding (in volume) | gal | 5.0 | 1.0
Metal Commodity Derivative |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ 0 | $ 0

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