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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - IMPACT OF ASC 470 ON THE UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Assets                
Nonutility plant and equipment, at cost $ 1,124,734     $ 1,108,512        
Accumulated depreciation and amortization, nonutility plant and equipment (163,852)     (140,562)        
Property, plant and equipment, net 4,030,467     3,722,769        
Other noncurrent assets 48,542     85,657        
Total noncurrent assets 859,893     971,376        
Total assets 5,408,618     5,316,477        
CAPITALIZATION                
Retained earnings 970,511     947,501        
Common stock equity 1,682,066 $ 1,821,833 $ 1,698,214 1,643,896 $ 1,612,478 $ 1,654,737 $ 1,608,092 $ 1,345,615
Total capitalization 3,903,688     3,903,362        
Liabilities                
Deferred income taxes 144,990     138,081        
Total noncurrent liabilities 891,304     879,393        
Total capitalization and liabilities $ 5,408,618     5,316,477        
As Previously Reported                
Assets                
Nonutility plant and equipment, at cost       1,430,723        
Accumulated depreciation and amortization, nonutility plant and equipment       (202,507)        
Property, plant and equipment, net       3,983,035        
Other noncurrent assets       78,716        
Total noncurrent assets       964,435        
Total assets       5,569,802        
CAPITALIZATION                
Retained earnings       1,148,297        
Common stock equity       1,844,692 1,838,927 1,889,107 1,827,803 1,551,717
Total capitalization       4,104,158        
Liabilities                
Deferred income taxes       190,610        
Total noncurrent liabilities       931,922        
Total capitalization and liabilities       5,569,802        
Effect of Change                
Assets                
Nonutility plant and equipment, at cost       (322,211)        
Accumulated depreciation and amortization, nonutility plant and equipment       61,945        
Property, plant and equipment, net       (260,266)        
Other noncurrent assets       6,941        
Total noncurrent assets       6,941        
Total assets       (253,325)        
CAPITALIZATION                
Retained earnings       (200,796)        
Common stock equity       (200,796) $ (226,449) $ (234,370) $ (219,711) $ (206,102)
Total capitalization       (200,796)        
Liabilities                
Deferred income taxes       (52,529)        
Total noncurrent liabilities       (52,529)        
Total capitalization and liabilities       $ (253,325)