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Revenue (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Three Months Ended March 31, 2019
 Electric Utilities
 Gas Utilities
 
 Power Generation (a)
 Mining
Inter-company Revenues (a)
Total
Customer types:
(in thousands)
Retail
$
153,463

$
354,275

 
$
—

$
15,829

$
(8,128
)
$
515,439

Transportation
—

44,517

 
—

—

(432
)
44,085

Wholesale
8,343

—

 
15,469

—

(13,213
)
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

 
15,469

15,829

(28,200
)
597,970

Other revenues
254

(1,119
)
(b) 
9,776

600

(9,671
)
(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

 
15,469

—

(20,072
)
590,269

Revenue from contracts with customers
$
182,673

$
412,199

 
$
15,469

$
15,829

$
(28,200
)
$
597,970

 
 
 
 
 
 
 
 




Three Months Ended March 31, 2018
 Electric Utilities
 Gas Utilities
 
 Power Generation (a)
 Mining
Inter-company Revenues (a)
Total
Customer Types:
 
 
 
 
 
 
 
Retail
$
147,057

$
341,394

 
$
—

$
16,557

$
(7,842
)
$
497,166

Transportation
—

41,669

 
—

—

(409
)
41,260

Wholesale
9,050

—

 
14,769

—

(13,049
)
10,770

Market - Off-System Sales
4,144

427

 
—

—

(2,522
)
2,049

Transmission/Other
13,071

12,670

 
—

—

(3,631
)
22,110

Revenue from contracts with customers
$
173,322

$
396,160

 
$
14,769

$
16,557

$
(27,453
)
$
573,355

Other Revenues
233

1,184

(b) 
9,170

571

(9,124
)
2,034

Total Revenues
$
173,555

$
397,344

 
$
23,939

$
17,128

$
(36,577
)
$
575,389

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

$
—

 
$
—

$
16,557

$
(7,842
)
$
8,715

Services transferred over time
173,322

396,160

 
14,769

—

(19,611
)
564,640

Revenue from contracts with customers
$
173,322

$
396,160

 
$
14,769

$
16,557

$
(27,453
)
$
573,355