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Revenue (Tables)
 3 Months Ended
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The following tables depict the disaggregation of revenue, including intercompany revenue, from contracts with customers by customer type and timing of revenue recognition for each of the reporting segments for the three months ended March 31, 2020 and 2019. Sales tax and other similar taxes are excluded from revenues.
 
 
 
 
 
 
 

 
 
 
 
 
 
 
Three Months Ended March 31, 2020
 Electric Utilities
 Gas Utilities
 Power Generation
 Mining
Inter-company Revenues
Total
Customer types:
(in thousands)
Retail
$
148,640

$
298,247

$
—

$
14,403

$
(7,839
)
$
453,451

Transportation
—

44,108

—

—

(139
)
43,969

Wholesale
5,552

—

25,467

—

(23,612
)
7,407

Market - off-system sales
4,867

138

—

—

(2,639
)
2,366

Transmission/Other
14,857

12,572

—

—

(4,413
)
23,016

Revenue from contracts with customers
$
173,916

$
355,065

$
25,467

$
14,403

$
(38,642
)
$
530,209

Other revenues
223

5,708

499

802

(391
)
6,841

Total revenues
$
174,139

$
360,773

$
25,966

$
15,205

$
(39,033
)
$
537,050

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

$
—

$
—

$
14,403

$
(7,839
)
$
6,564

Services transferred over time
173,916

355,065

25,467

—

(30,803
)
523,645

Revenue from contracts with customers
$
173,916

$
355,065

$
25,467

$
14,403

$
(38,642
)
$
530,209

 
 
 
 
 
 
 


Three Months Ended March 31, 2019
 Electric Utilities
 Gas Utilities
 Power Generation
 Mining
Inter-company Revenues
Total
Customer Types:
 
 
 
 
 
 
Retail
$
153,463

$
354,275

$
—

$
15,829

$
(8,128
)
$
515,439

Transportation
—

44,517

—

—

(432
)
44,085

Wholesale
8,343

—

24,147

—

(21,891
)
10,599

Market - off-system sales
6,692

217

—

—

(2,224
)
4,685

Transmission/Other
14,175

13,190

—

—

(4,203
)
23,162

Revenue from contracts with customers
$
182,673

$
412,199

$
24,147

$
15,829

$
(36,878
)
$
597,970

Other revenues
254

(1,119
)
1,098

600

(993
)
(160
)
Total Revenues
$
182,927

$
411,080

$
25,245

$
16,429

$
(37,871
)
$
597,810

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

$
—

$
—

$
15,829

$
(8,128
)
$
7,701

Services transferred over time
182,673

412,199

24,147

—

(28,750
)
590,269

Revenue from contracts with customers
$
182,673

$
412,199

$
24,147

$
15,829

$
(36,878
)
$
597,970