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Business Combination (Tables)
 9 Months Ended
Sep. 30, 2020
Business Combinations [Abstract]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
The following table summarizes the purchase price and recording of fair values of assets acquired and liabilities assumed as of the acquisition date and subsequent adjustments as of September 30, 2020.
 
Amounts Previously Recognized as of Acquisition Date (a)
 
Measurement Period Adjustments
 
Amounts Recognized as of Acquisition Date (as Adjusted)
Assets acquired:
 
 
 
 
 
Utility plant, net
$
750,703

 
$
—

 
$
750,703

Nonutility plant
848

 
—

 
848

Current assets
42,673

 
(1,167
)
 
41,506

Investments
12,489

 
—

 
12,489

Regulatory assets and deferred charges, less current portion
83,132

 
(4,307
)
 
78,825

Other intangible assets
17,181

 
—

 
17,181

Other assets
2,592

 
—

 
2,592

Goodwill
626,523

 
(1,222
)
 
625,301

Total assets acquired
1,536,141

 
(6,696
)
 
1,529,445

Liabilities assumed:
 
 
 
 
 
Long-term debt
281,009

 
—

 
281,009

Current liabilities, including maturities of long-term debt
125,772

 
25

 
125,797

Deferred income taxes
107,789

 
(7,145
)
 
100,644

Postretirement benefit plans
31,789

 
—

 
31,789

Contributions in aid of construction and construction advances
137,327

 
—

 
137,327

Other long-term liabilities
10,607

 
424

 
11,031

Total liabilities assumed
694,293

 
(6,696
)
 
687,597

Assumed equity
$
841,848

 
$
—

 
$
841,848