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EQUITY (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020
Common Stock Issued During Period, Shares, New Issues |  |  | 29,900 |  |  |  |  |
Public Offering Price |  |  | $ 32.00 |  |  |  |  |
Common Stock Issued During Period, Value, New Issues |  |  | $ 937,000 |  |  |  |  |
Dividends, Per Share, Cash Paid |  | $ 0.935 | $ 0.935 | $ 0.935 | $ 0.89 | $ 0.865 | $ 0.86 |
Dividends, Preferred Stock, Cash |  | $ 300 | $ 300 | $ 300 |  |  |  |
Preferred Stock, Dividends, Declared |  | $ 275 | $ 275 | $ 275 | $ 275 | $ 275 | $ 275 |
Issued Under Equity Agreement [Member] |  |  |  |  |  |  |  |
Common Stock Sold Under Equity Distribution Agreement |  | 0 |  |  |  |  |  |
ONEOK [Member] |  |  |  |  |  |  |  |
Aggregate Amount Of Common Shares Available For Issuance And Sale Under Equity Distribution Agreement |  | $ 1,000,000 |  |  |  |  |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  |  | 5.50%
Subsequent Event [Member] |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.935 |  |  |  |  |  |  |
Dividends Payable, Date of Record | Nov. 02, 2020 |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Nov. 13, 2020 |  |  |  |  |  |  |
Preferred Stock, Dividends, Declared | $ 300 |  |  |  |  |  |  |

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