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EQUITY EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
General partner ownership interest |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  | $ 195,000 |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  | $ 0.915 | $ 0.890 | $ 0.865 | $ 0.860 | $ 0.855 | $ 0.825 | $ 0.795 | $ 0.770 | $ 0.745 | $ 0.745 | $ 0.615 | $ 0.615 | $ 3.53 | $ 3.245 | $ 2.72
Dividends, Cash |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 | $ 1,300,000 | $ 829,400
Public Offering Price of Common Stock |  |  |  |  |  |  |  |  | $ 54.50 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  | 21,900,000 |  |  |  |  |  |  |
Noncash Contribution Expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 12,600
Dividends, Preferred Stock, Cash |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100 | 1,100 | 600
Preferred stock dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100 | $ 1,100 | $ 767
Proceeds from Issuance or Sale of Equity |  |  |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |
Issued Under Equity Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Sold Under Equity Distribution Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared, Annualized | $ 3.74 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.935 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends paid | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Jan. 27, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued Under Equity Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Sold Under Equity Distribution Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,400,000
Proceeds from Issuance or Sale of Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 448,300
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |
Noncash Contribution Expense |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  | $ 20,000
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.50% |  |
ONEOK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Amount Of Common Shares Available For Issuance And Sale Under Equity Distribution Agreement |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |

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