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REVENUE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Regulated Operating Revenue, Gas $ 1,787,815 $ 1,510,501 $ 1,647,479
Regulated Operating Revenue, Other 11,132 11,468 9,950
Regulated Operating Revenue 1,808,597 1,530,268 1,652,730
Natural gas sales to customers [Member]      
Regulated Operating Revenue, Gas 1,652,566 1,381,141 1,512,886
Transportation revenues [Member]      
Regulated Operating Revenue, Gas 118,492 113,855 114,014
Miscellaneous revenues [Member]      
Regulated Operating Revenue, Gas 16,757 15,505 20,579
Other revenues - natural gas sales related [Member]      
Other revenues - natural gas sales related 9,650 8,299 (4,699)
Other revenues [Member]      
Regulated Operating Revenue, Other $ 20,782 $ 19,767 $ 5,251