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Business Combination (Tables)
3 Months Ended
Mar. 31, 2020
Business Acquisition [Line Items]  
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
The following table summarizes the estimated preliminary fair value of assets acquired and liabilities assumed as of March 31, 2020.
 
Fair Value
Assets acquired:
 
Utility plant, net
$
750,703

Nonutility plant
848

Current assets
42,673

Investments
12,489

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

Other intangible assets
17,181

Other assets
2,592

Goodwill
626,523

Total assets acquired
1,536,141

Liabilities assumed:
 
Long-term debt
281,009

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

Deferred income taxes
107,789

Postretirement benefit plans
31,789

Contributions in aid of construction and construction advances
137,327

Other long-term liabilities
10,607

Total liabilities assumed
694,293

Assumed equity
$
841,848