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Revenue (Tables)
6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Six Months Ended June 30, 2019
 Electric Utilities
 Gas Utilities
 Power Generation (a)
 Mining
Inter-company Revenues (a)
Total
Customer types:
(in thousands)
Retail
$
293,195

$
477,905

$

$
28,257

$
(15,169
)
$
784,188

Transportation

73,140



(708
)
72,432

Wholesale
15,124


30,531


(26,509
)
19,146

Market - off-system sales
10,140

378



(3,559
)
6,959

Transmission/Other
28,591

24,802



(8,402
)
44,991

Revenue from contracts with customers
$
347,050

$
576,225

$
30,531

$
28,257

$
(54,347
)
$
927,716

Other revenues
2,231

324

19,422

1,217

(19,212
)
3,982

Total revenues
$
349,281

$
576,549

$
49,953

$
29,474

$
(73,559
)
$
931,698

 
 
 
 
 
 
 
Timing of revenue recognition:
 
 
 
 
 
 
Services transferred at a point in time
$

$

$

$
28,257

$
(15,169
)
$
13,088

Services transferred over time
347,050

576,225

30,531


(39,178
)
914,628

Revenue from contracts with customers
$
347,050

$
576,225

$
30,531

$
28,257

$
(54,347
)
$
927,716

 
 
 
 
 
 
 




Six Months Ended June 30, 2018
 Electric Utilities
 Gas Utilities
 Power Generation (a)
 Mining
Inter-company Revenues (a)
Total
Customer Types:
 
 
 
 
 
 
Retail
$
292,434

$
477,257

$

$
32,902

$
(15,821
)
$
786,772

Transportation

70,681



(710
)
69,971

Wholesale
17,241


28,371


(25,521
)
20,091

Market - Off-System Sales
9,082

589



(4,182
)
5,489

Transmission/Other
26,427

24,341



(7,275
)
43,493

Revenue from contracts with customers
$
345,184

$
572,868

$
28,371

$
32,902

$
(53,509
)
$
925,816

Other Revenues
1,987

2,096

18,311

1,125

(18,242
)
5,277

Total Revenues
$
347,171

$
574,964

$
46,682

$
34,027

$
(71,751
)
$
931,093

 
 
 
 
 
 
 
Timing of Revenue Recognition:
 
 
 
 
 
 
Services transferred at a point in time
$

$

$

$
32,902

$
(15,820
)
$
17,082

Services transferred over time
345,184

572,868

28,371


(37,689
)
908,734

Revenue from contracts with customers
$
345,184

$
572,868

$
28,371

$
32,902

$
(53,509
)
$
925,816

 
 
 
 
 
 
 

(a)
Due to the changes in our segment disclosures discussed in Note 3, Power Generation Wholesale revenue was revised for the three and six months ended June 30, 2018, which resulted in an increase of $0.9 million and $1.7 million, respectively. The changes to Power Generation Wholesale revenue were offset by changes to eliminations in Inter-company Revenues within Corporate and Other and there was no impact to our consolidated Total Revenues.