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Supplemental Gas and Oil Information (Tables)
 12 Months Ended
Dec. 31, 2012
Extractive Industries [Abstract]  
Capitalized costs of cost-of-service gas and oil properties net of the related accumulated depreciation and amortization
Capitalized costs of cost-of-service gas and oil properties net of the related accumulated depreciation, depletion and amortization are shown below:
 
December 31,
 
2012
 
2011
 
(in millions)
Wexpro
$
780.4

 
$
708.6

Questar Gas
7.8

 
8.5

Total capitalized costs of cost-of-service activities
$
788.2

 
$
717.1
Results of operation of cost-of-service gas- and oil-producing activities, before corporate overhead and interest expenses
Following are the results of operations for cost-of-service gas- and oil-producing activities, before corporate overhead and interest expenses:
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in millions)
Revenues
 
 
 
 
 
From unaffiliated customers
$
36.1

 
$
31.5

 
$
24.6

From affiliated company(1)
274.1

 
253.6

 
240.2

Total revenues
310.2

 
285.1

 
264.8

Production costs
50.1

 
51.2

 
48.1

Depreciation, depletion and amortization
77.4

 
63.9

 
62.1

Total expenses
127.5

 
115.1

 
110.2

Revenues less expenses
182.7

 
170.0

 
154.6

Income taxes
(64.8
)
 
(62.0
)
 
(54.9
)
Results of operations for cost-of-service gas- and oil-producing activities excluding corporate overhead and interest expenses
$
117.9

 
$
108.0

 
$
99.7


(1) Primarily represents revenues received from Questar Gas pursuant to the Wexpro Agreement. Revenues include reimbursement of general and administrative expenses amounting to $26.5 million in 2012, $23.5 million in 2011 and $19.8 million in 2010.
Estimated quantities of cost-of-service proved gas and oil reserves
Estimated quantities of cost-of-service proved gas and oil reserves are set forth below:
 
Natural Gas
 
Oil and NGL
 
Natural Gas
Equivalents
 
(Bcf)
 
(Mbbl)
 
(Bcfe)
Proved Reserves
 
 
 
 
 
Balances at December 31, 2009
649.4

 
4,483

 
676.3

Revisions - previous estimates
(202.3
)
 
(1,297
)
 
(210.1
)
Extensions and discoveries
341.5

 
2,107

 
354.2

Production
(50.2
)
 
(437
)
 
(52.9
)
Balances at December 31, 2010
738.4

 
4,856

 
767.5

Revisions - previous estimates
(153.9
)
 
(259
)
 
(155.5
)
Extensions and discoveries
224.7

 
1,214

 
232.0

Production
(50.5
)
 
(467
)
 
(53.3
)
Balances at December 31, 2011
758.7

 
5,344

 
790.7

Revisions - previous estimates
(158.4
)
 
(122
)
 
(159.0
)
Extensions and discoveries
154.4

 
1,612

 
164.0

Production
(57.5
)
 
(665
)
 
(61.5
)
Balances at December 31, 2012
697.2

 
6,169

 
734.2

 
 
 
 
 
 
Proved Developed Reserves
 
 
 
 
 
Balances at December 31, 2009
477.1

 
3,070

 
495.5

Balances at December 31, 2010
463.8

 
3,138

 
482.6

Balances at December 31, 2011
491.2

 
4,420

 
517.7

Balances at December 31, 2012
523.9

 
4,967

 
553.7

 
 
 
 
 
 
Proved Undeveloped Reserves
 
 
 
 
 
Balances at December 31, 2009
172.3

 
1,413

 
180.8

Balances at December 31, 2010
274.6

 
1,718

 
284.9

Balances at December 31, 2011
267.5

 
924

 
273.0

Balances at December 31, 2012
173.3

 
1,202

 
180.5