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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 21, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2021
Debt Instrument [Line Items]          
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   0.81%      
Repayments of Long-term Debt   $ 400,000 $ 0 $ 0  
Debt Instrument, Covenant Compliance, Default Provision, Indebtnedness Threshold   $ 100,000      
Debt Instrument, Covenant Compliance, Default Provision, Debt Holders   0.25      
Debt Instrument, Redemption Price, Percentage   100.00%      
Debt Instrument, Covenant Description   The indenture governing our Senior Notes includes an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25 percent in the aggregate principal amount of the outstanding Senior Notes to declare those senior notes immediately due and payable in full.      
Debt Instrument, Call Feature   We may redeem our Senior Notes at par, plus accrued and unpaid interest to the redemption date, starting one month, three months, and six months, respectively, before their maturity dates. Prior to these dates, we may redeem these Senior Notes, in whole or in part, at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. The redemption price will never be less than 100 percent of the principal amount of the respective note plus accrued and unpaid interest to the redemption date. Our Senior Notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.      
Notes Payable at 0.85% Due 2023          
Debt Instrument [Line Items]          
Long-term Debt, Gross   $ 1,000,000      
Debt Instrument, Interest Rate, Stated Percentage   0.85%      
OGS Note Payable at 1.10% Due 2024          
Debt Instrument [Line Items]          
Long-term Debt, Gross   $ 700,000      
Debt Instrument, Interest Rate, Stated Percentage   1.10%      
OGS Note Payable with Floating-Rate Due 2023          
Debt Instrument [Line Items]          
Long-term Debt, Gross   $ 400,000     $ 800,000
Debt Instrument, Interest Rate Terms   The floating-rate senior notes bear interest at a rate equal to three-month LIBOR plus 61 basis points per year reset quarterly for the applicable interest period (      
Repayments of Long-term Debt $ 400,000        
Note Payable Due 2030 [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross   $ 300,000      
Debt Instrument, Interest Rate, Stated Percentage   2.00%      
Note Payable Due 2024 [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross   $ 300,000      
Debt Instrument, Interest Rate, Stated Percentage   3.61%      
Notes Payable Due 2044 [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross   $ 600,000      
Debt Instrument, Interest Rate, Stated Percentage   4.658%      
Note Payable Due 2048 [Member]          
Debt Instrument [Line Items]          
Long-term Debt, Gross   $ 400,000      
Debt Instrument, Interest Rate, Stated Percentage   4.50%