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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Details)
$ in Thousands, bbl in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
bbl
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
INVESTMENTS IN UNCONSOLIDATED AFFILIATES          
Carrying value of investments in unconsolidated affiliates $ 226,252   $ 226,252   $ 225,425
Earnings from unconsolidated affiliates 1,850 $ 1,225 4,003 $ 2,365  
Additional capital investments in unconsolidated affiliates 506 1,076 3,171 1,301  
Cash distributions received from unconsolidated affiliates $ 4,456 3,102 $ 6,347 6,014  
BOSTCO          
INVESTMENTS IN UNCONSOLIDATED AFFILIATES          
Storage capacity | bbl     7.1    
Percentage of ownership 42.50%   42.50%   42.50%
Carrying value of investments in unconsolidated affiliates $ 202,671   $ 202,671   $ 201,743
Excess investment 6,500   6,500   6,600
Earnings from unconsolidated affiliates 1,302 563 2,810 1,139  
Additional capital investments in unconsolidated affiliates 506 1,076 3,171 1,076  
Cash distributions received from unconsolidated affiliates 3,636 2,289 5,053 4,697  
Balance sheets:          
Current assets 18,188   18,188   12,478
Long-term assets 459,638   459,638   464,085
Current liabilities (10,797)   (10,797)   (13,607)
Long-term liabilities (5,757)   (5,757)   (6,036)
Net assets 461,272   461,272   $ 456,920
Statements of income:          
Revenue 15,885 14,864 32,321 31,470  
Expenses (12,585) (13,229) (25,236) (27,283)  
Net income $ 3,300 1,635 $ 7,085 4,187  
Frontera          
INVESTMENTS IN UNCONSOLIDATED AFFILIATES          
Storage capacity | bbl     1.7    
Percentage of ownership 50.00%   50.00%   50.00%
Carrying value of investments in unconsolidated affiliates $ 23,581   $ 23,581   $ 23,682
Earnings from unconsolidated affiliates 548 662 1,193 1,226  
Additional capital investments in unconsolidated affiliates       225  
Cash distributions received from unconsolidated affiliates 820 813 1,294 1,317  
Balance sheets:          
Current assets 4,078   4,078   4,870
Long-term assets 44,530   44,530   44,344
Current liabilities (1,446)   (1,446)   (1,850)
Net assets 47,162   47,162   $ 47,364
Statements of income:          
Revenue 4,772 5,011 9,808 10,109  
Expenses (3,676) (3,687) (7,422) (7,657)  
Net income $ 1,096 $ 1,324 $ 2,386 $ 2,452  
Class A Member Ownership Interest | BOSTCO          
INVESTMENTS IN UNCONSOLIDATED AFFILIATES          
Cash distributions, allocation percentage     96.50%    
Class B Member Ownership Interest | BOSTCO          
INVESTMENTS IN UNCONSOLIDATED AFFILIATES          
Cash distributions, allocation percentage     3.50%