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PARTNERS' EQUITY Table 6 - Net Income Applicable to the General Partner (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net Income Allocation [Abstract]                        
Net income (loss) $ 78,408 $ 47,811 $ 45,951 $ (277,863) $ 2,126 $ 48,136 $ 29,399 $ 126,133   $ (105,693) $ 205,794 $ 147,964
Less preferred limited partner interest                   121,693 92,540 40,448
Less general partner incentive distribution                   0 0 45,669
Net income (loss) after general partner incentive distribution and preferred limited partner interest                       $ 61,847
General partner interest                 2.00%     2.00%
General partner allocation of net income (loss)                       $ 1,237
General partner incentive distribution                   $ 0 0 45,669
Net income applicable to general partner                     $ 2,500 $ 46,906