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Supplemental Gas and Oil Information (Tables)
 12 Months Ended
Dec. 31, 2011
Notes to Financial Statements [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,
 
2011
 
2010
 
(in millions)
Wexpro
$
708.6

 
$
621.3

Questar Gas
8.5

 
9.4

Total capitalized costs of cost-of-service activities
$
717.1

 
$
630.7
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,
 
2011
 
2010
 
2009
 
(in millions)
Revenues
 
 
 
 
 
From unaffiliated customers
$
31.5

 
$
24.6

 
$
17.8

From affiliated company(1)
253.6

 
240.2

 
225.1

Total revenues
285.1

 
264.8

 
242.9

Production costs
51.2

 
48.1

 
42.1

Depreciation, depletion and amortization
63.9

 
62.1

 
58.8

Total expenses
115.1

 
110.2

 
100.9

Revenues less expenses
170.0

 
154.6

 
142.0

Income taxes
(62.0
)
 
(54.9
)
 
(51.7
)
Results of operations for cost-of-service gas- and oil-producing activities excluding corporate overhead and interest expenses
$
108.0

 
$
99.7

 
$
90.3


(1) Primarily represents revenues received from Questar Gas pursuant to the Wexpro Agreement. Revenues include reimbursement of general and administrative expenses amounting to $23.5 million in 2011, $19.8 million in 2010 and $16.7 million in 2009.
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)
 
(MMbbl)
 
(Bcfe)
Proved Reserves
 
 
 
 
 
Balance at December 31, 2008
646.9

 
4.5

 
673.9

Revisions - previous estimates
(27.3
)
 
(0.2
)
 
(28.3
)
Extensions and discoveries
78.0

 
0.6

 
81.4

Production
(48.2
)
 
(0.4
)
 
(50.7
)
Balance at December 31, 2009
649.4

 
4.5

 
676.3

Revisions - previous estimates
(202.3
)
 
(1.3
)
 
(210.1
)
Extensions and discoveries
341.5

 
2.1

 
354.2

Production
(50.2
)
 
(0.4
)
 
(52.9
)
Balance at December 31, 2010
738.4

 
4.9

 
767.5

Revisions - previous estimates
(153.9
)
 
(0.3
)
 
(155.5
)
Extensions and discoveries
224.7

 
1.2

 
232.0

Production
(50.5
)
 
(0.5
)
 
(53.3
)
Balance at December 31, 2011
758.7

 
5.3

 
790.7

 
 
 
 
 
 
Proved Developed Reserves
 
 
 
 
 
Balance at December 31, 2008
471.4

 
3.1

 
489.9

Balance at December 31, 2009
477.1

 
3.1

 
495.5

Balance at December 31, 2010
463.8

 
3.2

 
482.6

Balance at December 31, 2011
491.2

 
4.4

 
517.7

 
 
 
 
 
 
Proved Undeveloped Reserves
 
 
 
 
 
Balance at December 31, 2008
175.5

 
1.4

 
184.0

Balance at December 31, 2009
172.3

 
1.4

 
180.8

Balance at December 31, 2010
274.6

 
1.7

 
284.9

Balance at December 31, 2011
267.5

 
0.9

 
273.0