v3.10.0.1
FAIR VALUE MEASUREMENTS Table 1 - Recurring Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Liabilities:    
Total liabilities   $ (12,400)
Fair Value Level 1    
Liabilities:    
Total liabilities   (2,412)
Fair Value Level 2    
Liabilities:    
Total liabilities   (9,988)
Fair Value Level 3    
Liabilities:    
Total liabilities   0
Other current assets    
Assets:    
Product imbalances - asset   3,890
Other current assets | Fair Value Level 1    
Assets:    
Product imbalances - asset   3,890
Other current assets | Fair Value Level 2    
Assets:    
Product imbalances - asset   0
Other current assets | Fair Value Level 3    
Assets:    
Product imbalances - asset   0
Other long-term assets, net    
Assets:    
Interest rate swaps - assets $ 4,491  
Other long-term assets, net | Fair Value Level 1    
Assets:    
Interest rate swaps - assets 0  
Other long-term assets, net | Fair Value Level 2    
Assets:    
Interest rate swaps - assets 4,491  
Other long-term assets, net | Fair Value Level 3    
Assets:    
Interest rate swaps - assets 0  
Accrued liabilities    
Liabilities:    
Product imbalances - liability   (1,534)
Commodity derivatives - liabilities (247) (878)
Interest rate swaps - liabilities   (5,394)
Accrued liabilities | Fair Value Level 1    
Liabilities:    
Product imbalances - liability   (1,534)
Commodity derivatives - liabilities (247) (878)
Interest rate swaps - liabilities   0
Accrued liabilities | Fair Value Level 2    
Liabilities:    
Product imbalances - liability   0
Commodity derivatives - liabilities 0 0
Interest rate swaps - liabilities   (5,394)
Accrued liabilities | Fair Value Level 3    
Liabilities:    
Product imbalances - liability   0
Commodity derivatives - liabilities $ 0 0
Interest rate swaps - liabilities   0
Other long-term liabilities    
Liabilities:    
Interest rate swaps - liabilities   (4,594)
Other long-term liabilities | Fair Value Level 1    
Liabilities:    
Interest rate swaps - liabilities   0
Other long-term liabilities | Fair Value Level 2    
Liabilities:    
Interest rate swaps - liabilities   (4,594)
Other long-term liabilities | Fair Value Level 3    
Liabilities:    
Interest rate swaps - liabilities   $ 0