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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Deferred Charges and Other Assets, Net) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Other non-service component of net periodic benefit costs | $ (1,109) | $ 1,402 | $ 580
Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Refinery turnaround amortization period | 3 years |  |
Intangible assets estimated useful lives | 1 year |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Refinery turnaround amortization period | 5 years |  |
Intangible assets estimated useful lives | 10 years |  |
Revolving Credit Facility And Senior Secured Notes [Member] | Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization over life of loan | 1 year |  |
Revolving Credit Facility And Senior Secured Notes [Member] | Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization over life of loan | 8 years |  |

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