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REGULATORY ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2017
Dec. 31, 2019
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Kansas Gas Service tax reform regulatory liability $ 81,500   $ 81,500      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00%   35.00%  
Regulatory Assets, Current 47,961   $ 47,961     $ 47,440
Regulatory Assets, Noncurrent 373,241   373,241     391,036
Regulatory Liability, Current (26,163)   (26,163)     (45,201)
Regulatory Liability, Noncurrent (558,115)   (558,115)     (503,518)
Net regulatory assets (liabilities), current 21,798   21,798     2,239
Net regulatory assets (liabilities), noncurrent (184,874)   (184,874)     (112,482)
Net Regulatory Assets (163,076)   (163,076)     (110,243)
Reduction in income tax expense for the amortization of the regulatory liability associated with excess ADIT that was returned to customers 2,500 $ 2,100 9,400 $ 8,900    
Income tax rate changes [Member] [Domain]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Liability, Current (2,265)   (2,265)     (10,297)
Regulatory Liability, Noncurrent (558,115)   (558,115)     (503,518)
Regulatory Liabilities (560,380)   (560,380)     (513,815)
Over-recovered purchased-gas costs [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Liability, Current (23,898)   (23,898)     (27,623)
Regulatory Liability, Noncurrent 0   0     0
Regulatory Liabilities (23,898)   (23,898)     (27,623)
Total regulated liabilities [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Liability, Current (26,163)   (26,163)     (45,201)
Regulatory Liability, Noncurrent (558,115)   (558,115)     (503,518)
Regulatory Liabilities (584,278)   (584,278)     (548,719)
Under-recovered purchased-gas costs [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Assets, Current 7,247   7,247     17,172
Regulatory Assets, Noncurrent 0   0     0
Regulatory Assets 7,247   7,247     17,172
Pension and postretirement benefit costs [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Assets, Current 21,156   21,156     21,213
Regulatory Assets, Noncurrent 353,616   353,616     373,266
Regulatory Assets 374,772   374,772     394,479
Weather normalization [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Assets, Current 4,674   4,674      
Regulatory Assets, Noncurrent 0   0      
Regulatory Assets 4,674   4,674      
Regulatory Liability, Current           (7,281)
Regulatory Liability, Noncurrent           0
Regulatory Liabilities           (7,281)
Reacquired debt costs [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Assets, Current 812   812     812
Regulatory Assets, Noncurrent 5,271   5,271     5,677
Regulatory Assets 6,083   6,083     6,489
MGP Costs [Member] [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Assets, Current 98   98     98
Regulatory Assets, Noncurrent 11,660   11,660     9,709
Regulatory Assets 11,758   11,758     9,807
Ad valorem tax [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Assets, Current 4,095   4,095     2,921
Regulatory Assets, Noncurrent 0   0     0
Regulatory Assets 4,095   4,095     2,921
Other regulatory assets [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Assets, Current 9,879   9,879     5,224
Regulatory Assets, Noncurrent 2,694   2,694     2,384
Regulatory Assets 12,573   12,573     7,608
Total regulatory assets, net of amortization [Member]            
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]            
Regulatory Assets, Current 47,961   47,961     47,440
Regulatory Assets, Noncurrent 373,241   373,241     391,036
Regulatory Assets $ 421,202   $ 421,202     $ 438,476