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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Share-based Compensation [Abstract]  
Calculated fair value of options granted and major assumptions used in the Black-Scholes-Merton model
The calculated fair value of options granted and major assumptions used in the model at the date of the 2010 and 2009 grants are listed below:
 
 
2010
 
2009
 
 
Stock Option Input Variables
 
Range of Stock
Option Variables
Fair value of options at grant date
 
$13.10
 
$10.01 - $11.40
Risk-free interest rate
 
2.30
%
 
1.78% - 2.51%
Expected price volatility
 
30.3
%
 
28.1% - 29.9%
Expected dividend yield
 
1.18
%
 
1.39% - 1.61%
Expected life in years
 
5.2

 
5.0 - 5.0
Transactions involving stock options under the terms of the LTSIP
Stock-option transactions under the terms of the LTSIP are summarized for the year ended December 31, 2011, below:

 
Options
Outstanding
 
Price Range
 
Weighted
Average
Price
Balance at December 31, 2010
2,560,059

 
$ 3.70 - $17.35
 
$
7.30

Exercised
(786,424
)
 
3.70 - 13.10
 
4.49

Balance at December 31, 2011
1,773,635

 
$ 3.70 - $17.35
 
$
8.54


Options Outstanding
 
Options Exercisable
 
Unvested Options
Range of exercise
prices
 
Number outstanding at Dec. 31, 2011
 
Weighted-average remaining term in years
 
Weighted-average exercise price
 
Number exercisable at Dec. 31, 2011
 
Weighted-average exercise price
 
Number unvested
at Dec. 31, 2011
 
Weighted- average exercise price
$ 3.70 - $ 4.37
 
791,261

 
1.0

 
$
4.29

 
791,261

 
$
4.29

 
—

 
$
—

7.84 - 11.40
 
449,174

 
3.9

 
10.61

 
390,177

 
10.49

 
58,997

 
11.40

12.43 - 17.35
 
533,200

 
3.2

 
13.11

 
474,403

 
13.11

 
58,797

 
13.10

 
 
1,773,635

 
2.4

 
$
8.54

 
1,655,841

 
$
8.28

 
117,794

 
$
12.25
Transactions involving restricted shares under the terms of the LTSIP
Transactions involving restricted shares under the terms of the LTSIP for the year ended December 31, 2011, are summarized below:

 
Restricted Shares Outstanding
 
Price Range
 
Weighted Average Price
Balance at December 31, 2010
568,707

 
$11.40 - $20.31
 
$
14.66

Granted
348,127

 
17.50 - 17.97
 
17.96

Distributed
(133,391
)
 
11.40 - 20.31
 
14.09

Forfeited
(11,893
)
 
11.40 - 17.97
 
16.45

Balance at December 31, 2011
771,550

 
$11.40 - $17.97
 
$
16.22
Options held under the LTSIP of Questar Pipeline and Questar Gas
The following table summarizes the stock options held under the LTSIP of Questar Pipeline and Questar Gas at December 31, 2011:

Options Outstanding
Options Exercisable
 
Unvested Options
Range of exercise
prices
Number outstanding at Dec. 31, 2011
 
Weighted-average remaining term in years
 
Weighted-average exercise price
 
Number exercisable at Dec. 31, 2011
 
Weighted-average exercise price
 
Number unvested
at Dec. 31, 2011
 
Weighted- average exercise price
Questar Pipeline
 
 
 
 
 
 
 
 
 
 
 
 
 
$  3.70 - $13.10
231,514

 
3.1

 
$
8.56

 
194,650

 
$
7.86

 
36,864

 
$
12.25

Questar Gas
 
 
 
 
 
 
 
 
 
 
 
 
 
$  3.70 - $13.10
99,046

 
1.6

 
$
5.66

 
91,047

 
$
5.07

 
7,999

 
$
12.39
Restricted shares held under the LTSIP of Questar Pipeline and Questar Gas
The following table summarizes the restricted shares held under the LTSIP of Questar Pipeline and Questar Gas at December 31, 2011. The weighted average vesting period of unvested restricted shares at December 31, 2011, for Questar Pipeline was 13 months, and 14 months for Questar Gas.

 
Restricted
Shares Outstanding
 
Price Range
 
Weighted-
Average
Price
 
 
 
 
 
 
Questar Pipeline
153,888

 
$11.40 - $17.97
 
$
16.18

Questar Gas
89,561

 
$11.40 - $17.97
 
$
16.40