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EQUITY (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock Issued During Period, Shares, New Issues               29,900                
Public Offering Price               $ 32.00                
Dividends, Cash                           $ 1,700,000 $ 1,600,000 $ 1,500,000
Common Stock, Dividends, Per Share, Cash Paid   $ 0.935 $ 0.935 $ 0.935 $ 0.935 $ 0.935 $ 0.935 $ 0.935 $ 0.935 $ 0.915 $ 0.890 $ 0.865 $ 0.860 $ 3.74 $ 3.74 $ 3.53
Stock Issued During Period, Value, New Issues               $ 937,000                
Dividends, Preferred Stock, Cash                           $ 1,100 $ 1,100 $ 1,100
Preferred stock dividends paid                           $ 1,100 $ 1,100 $ 1,100
Issued Under Equity Agreement                                
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 A Preferred Stock [Member]                                
Preferred Stock, Shares Outstanding   0                       0    
Series E Preferred Stock [Member]                                
Preferred Stock, Dividend Rate, Percentage                           5.50%    
Subsequent Event [Member]                                
Common Stock, Dividends, Per Share, Declared $ 0.935                              
Common Stock, Dividends, Per Share, Declared, Annualized $ 3.74                              
Dividends Payable, Date of Record Jan. 31, 2022                              
Preferred stock dividends paid $ 300