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Summary of Accounting Policies Impact of Adoption of ASC 606 (Tables)
 3 Months Ended
Mar. 31, 2018
Revenue from Contract with Customer [Abstract]  
Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block]
The following highlights the impact of the adoption of ASC 606 on our condensed consolidated income statement and condensed consolidated balance sheet for the three months ended March 31, 2018:
 
 
Three months ended March 31, 2018
Income statement
 
As Reported
 
Without Adoption of ASC 606
 
Effect of Change Higher (Lower)
(in thousands)
 
 
 
 
 
 
Regulated Energy operating revenues
 
$
109,393

 
$
110,357

 
$
(964
)
Regulated Energy cost of sales
 
$
48,231

 
$
48,803

 
$
(572
)
Depreciation and amortization
 
$
9,704

 
$
9,689

 
$
15

Income before income taxes
 
$
36,810

 
$
37,217

 
$
(407
)
Income taxes
 
$
9,955

 
$
10,077

 
$
(122
)
Net income
 
$
26,855

 
$
27,140

 
$
(285
)
 
 
As of March 31, 2018
Balance sheet
 
As Reported
 
Without Adoption of ASC 606
 
Effect of Change Higher (Lower)
(in thousands)
 
 
 
 
 
 
Assets
 
 
 
 
 
 
Accrued revenues
 
$
18,907

 
$
20,213

 
$
(1,306
)
Other assets
 
$
4,316

 
$
4,508

 
$
(192
)
 
 
 
 
 
 

Capitalization
 
 
 
 
 

Retained earnings
 
$
250,024

 
$
251,522

 
$
(1,498
)