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Supplemental Gas and Oil Information - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2013
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,
 
2013
 
2012
 
(in millions)
Wexpro
$
936.6

 
$
780.4

Questar Gas
7.2

 
7.8

Total capitalized costs of cost-of-service activities
$
943.8

 
$
788.2
Cost incurred for cost-of-service gas and oil development activities
The costs incurred for cost-of-service gas and oil development activities are displayed in the table below. The costs incurred to develop proved undeveloped reserves were $106.3 million in 2013, $50.4 million in 2012 and $69.7 million in 2011.
 
Year Ended December 31,
 
2013
 
2012
 
2011
 
(in millions)
Property acquisition
 
 
 
 
 
Unproved
$
0.3

 
$
0.6

 
$
—

Proved
106.4

 
—

 
—

Development
133.1

 
146.9

 
149.1

Total costs incurred for cost-of-service activities
$
239.8

 
$
147.5

 
$
149.1
Results of operations for 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,
 
2013
 
2012
 
2011
 
(in millions)
Revenues
 
 
 
 
 
From unaffiliated customers
$
45.1

 
$
36.1

 
$
31.5

From affiliated company(1)
294.8

 
274.1

 
253.6

Total revenues
339.9

 
310.2

 
285.1

Production costs
57.5

 
50.1

 
51.2

Depreciation, depletion and amortization
85.8

 
77.4

 
63.9

Total expenses
143.3

 
127.5

 
115.1

Revenues less expenses
196.6

 
182.7

 
170.0

Income taxes
(70.5
)
 
(64.8
)
 
(62.0
)
Results of operations for cost-of-service gas- and oil-producing activities excluding corporate overhead and interest expenses
$
126.1

 
$
117.9

 
$
108.0


(1) Primarily represents revenues received from Questar Gas pursuant to the Wexpro Agreement. Revenues include reimbursement of general and administrative expenses amounting to $27.5 million in 2013, $26.5 million in 2012 and $23.5 million in 2011.
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, 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

Revisions - previous estimates
(112.8
)
 
(1,348
)
 
(120.8
)
Extensions and discoveries
153.5

 
857

 
158.6

Purchase of reserves in place
133.9

 
556

 
137.2

Production
(60.6
)
 
(617
)
 
(64.3
)
Balances at December 31, 2013
811.2

 
5,617

 
844.9

 
 
 
 
 
 
Proved Developed Reserves
 
 
 
 
 
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

Balances at December 31, 2013
560.0

 
4,384

 
586.3

 
 
 
 
 
 
Proved Undeveloped Reserves
 
 
 
 
 
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

Balances at December 31, 2013
251.2

 
1,233

 
258.6