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Selected Balance Sheet Data (Tables)
 6 Months Ended
Jun. 30, 2016
Balance Sheet Related Disclosures [Abstract]  
Accounts Receivable, Net
(Thousands of Dollars)
 
June 30, 2016
 
Dec. 31, 2015
Accounts receivable, net (a)
 
 
 
 
Accounts receivable
 
$
56,005

 
$
61,506

Less allowance for bad debts
 
(4,226
)
 
(5,128
)
 
 
$
51,779

 
$
56,378

 [1]
Inventories
(Thousands of Dollars)
 
June 30, 2016
 
Dec. 31, 2015
Inventories
 
 
 
 
Materials and supplies
 
$
7,131

 
$
6,785

Fuel
 
5,540

 
6,528

Natural gas
 
3,459

 
8,246

 
 
$
16,130

 
$
21,559
Property, Plant and Equipment, Net
(Thousands of Dollars)
 
June 30, 2016
 
Dec. 31, 2015
Property, plant and equipment, net
 
 
 
 
Electric plant
 
$
2,446,606

 
$
2,411,562

Natural gas plant
 
278,389

 
275,376

Common and other property
 
136,356

 
132,329

Construction work in progress
 
97,755

 
65,755

Total property, plant and equipment
 
2,959,106

 
2,885,022

Less accumulated depreciation
 
(1,089,991
)
 
(1,056,943
)
 
 
$
1,869,115

 
$
1,828,079
[1] Accounts receivable, net includes an immaterial amount due from affiliates as of June 30, 2016 and Dec. 31, 2015, respectively.