v3.8.0.1
FAIR VALUE MEASUREMENTS Table 1 - Recurring Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets:    
Total assets $ 7,854  
Liabilities:    
Total liabilities (678) $ (12,400)
Fair Value Level 1    
Assets:    
Total assets 0  
Liabilities:    
Total liabilities (257) (2,412)
Fair Value Level 2    
Assets:    
Total assets 7,854  
Liabilities:    
Total liabilities (421) (9,988)
Fair Value Level 3    
Assets:    
Total assets 0  
Liabilities:    
Total liabilities 0 0
Other current assets    
Assets:    
Interest rate swaps - assets 5,547  
Product imbalances - asset   3,890
Other current assets | Fair Value Level 1    
Assets:    
Interest rate swaps - assets 0  
Product imbalances - asset   3,890
Other current assets | Fair Value Level 2    
Assets:    
Interest rate swaps - assets 5,547  
Product imbalances - asset   0
Other current assets | Fair Value Level 3    
Assets:    
Interest rate swaps - assets 0  
Product imbalances - asset   0
Other long-term assets, net    
Assets:    
Interest rate swaps - assets 2,307  
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 2,307  
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 (257) (878)
Interest rate swaps - liabilities (114) (5,394)
Accrued liabilities | Fair Value Level 1    
Liabilities:    
Product imbalances - liability   (1,534)
Commodity derivatives - liabilities (257) (878)
Interest rate swaps - liabilities 0 0
Accrued liabilities | Fair Value Level 2    
Liabilities:    
Product imbalances - liability   0
Commodity derivatives - liabilities 0 0
Interest rate swaps - liabilities (114) (5,394)
Accrued liabilities | Fair Value Level 3    
Liabilities:    
Product imbalances - liability   0
Commodity derivatives - liabilities 0 0
Interest rate swaps - liabilities 0 0
Other long-term liabilities    
Liabilities:    
Interest rate swaps - liabilities (307) (4,594)
Other long-term liabilities | Fair Value Level 1    
Liabilities:    
Interest rate swaps - liabilities 0 0
Other long-term liabilities | Fair Value Level 2    
Liabilities:    
Interest rate swaps - liabilities (307) (4,594)
Other long-term liabilities | Fair Value Level 3    
Liabilities:    
Interest rate swaps - liabilities $ 0 $ 0