v3.8.0.1
FAIR VALUE MEASUREMENTS Table 1 - Recurring Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Total (assets)   $ 3,020
Liabilities:    
Total (liabilities) $ (12,400) (10,491)
Level 1 [Member]    
Assets:    
Total (assets)   1,551
Liabilities:    
Total (liabilities) (2,412) (6,464)
Level 2 [Member]    
Assets:    
Total (assets)   1,469
Liabilities:    
Total (liabilities) (9,988) (2,797)
Level 3 [Member]    
Assets:    
Total (assets)   0
Liabilities:    
Total (liabilities) 0 (1,230)
Other current assets    
Assets:    
Product imbalances - asset 3,890 1,551
Commodity derivatives - asset   155
Other current assets | Level 1 [Member]    
Assets:    
Product imbalances - asset 3,890 1,551
Commodity derivatives - asset   0
Other current assets | Level 2 [Member]    
Assets:    
Product imbalances - asset 0 0
Commodity derivatives - asset   155
Other current assets | Level 3 [Member]    
Assets:    
Product imbalances - asset 0 0
Commodity derivatives - asset   0
Other long-term assets, net    
Assets:    
Interest rate swaps - asset   1,314
Other long-term assets, net | Level 1 [Member]    
Assets:    
Interest rate swaps - asset   0
Other long-term assets, net | Level 2 [Member]    
Assets:    
Interest rate swaps - asset   1,314
Other long-term assets, net | Level 3 [Member]    
Assets:    
Interest rate swaps - asset   0
Accrued liabilities    
Liabilities:    
Product imbalances - liability (1,534) (1,577)
Commodity derivatives - liability (878) (5,052)
Interest rate swaps - liability (5,394)  
Accrued liabilities | Level 1 [Member]    
Liabilities:    
Product imbalances - liability (1,534) (1,577)
Commodity derivatives - liability (878) (4,887)
Interest rate swaps - liability 0  
Accrued liabilities | Level 2 [Member]    
Liabilities:    
Product imbalances - liability 0 0
Commodity derivatives - liability 0 (165)
Interest rate swaps - liability (5,394)  
Accrued liabilities | Level 3 [Member]    
Liabilities:    
Product imbalances - liability 0 0
Commodity derivatives - liability 0 0
Interest rate swaps - liability 0  
Other long-term liabilities    
Liabilities:    
Guarantee liability   (1,230)
Interest rate swaps - liability (4,594) (2,632)
Other long-term liabilities | Level 1 [Member]    
Liabilities:    
Guarantee liability   0
Interest rate swaps - liability 0 0
Other long-term liabilities | Level 2 [Member]    
Liabilities:    
Guarantee liability   0
Interest rate swaps - liability (4,594) (2,632)
Other long-term liabilities | Level 3 [Member]    
Liabilities:    
Guarantee liability   (1,230)
Interest rate swaps - liability $ 0 $ 0