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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
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, 2013, below:
 
Options
Outstanding
 
Exercise
Price Range
 
Weighted-Average Exercise Price
Balance at December 31, 2012
770,923

 
$
4.37

-
$
17.35

 
$
11.35

Exercised
(53,083
)
 
4.37

-
13.10

 
4.75

Balance at December 31, 2013
717,840

 
$
7.84

-
$
17.35

 
$
11.84
Options held under the LTSIP, by exercise price range
Options Outstanding
 
Options Exercisable
Range of
exercise
prices
 
Number outstanding at Dec. 31, 2013
 
Weighted-average remaining term in years
 
Weighted-average exercise price
 
Number exercisable at Dec. 31, 2013
 
Weighted-average exercise price
$
7.84

-
$
11.40

 
404,174

 
1.9
 
$
10.52

 
404,174

 
$
10.52

13.10

-
17.35

 
313,666

 
2.5
 
13.54

 
313,666

 
13.54

 

 
 
 
717,840

 
2.2
 
$
11.84

 
717,840

 
$
11.84
Transactions involving restricted shares and RSUs under the terms of the LTSIP
Transactions involving restricted shares under the terms of the LTSIP for the year ended December 31, 2013, are summarized below:
 
Restricted Shares Outstanding
 
Price Range
 
Weighted- Average Price
Balance at December 31, 2012
810,342

 
$
13.10

-
$
20.90

 
$
17.74

Granted
658

 
21.53

-
21.53

 
21.53

Vested
(417,882
)
 
13.10

-
20.90

 
17.24

Forfeited
(791
)
 
19.39

-
19.39

 
19.39

Balance at December 31, 2013
392,327

 
$
13.10

-
$
21.53

 
$
18.28

Transactions involving RSUs under the terms of the LTSIP are summarized below:
 
RSUs
Outstanding
 
Price Range
 
Weighted-Average Price
Granted
330,061

 
$
22.17

-
$
25.44

 
$
23.62

Vested
(12,522
)
 
23.62

-
23.62

 
23.62

Forfeited
(1,271
)
 
23.62

-
23.62

 
23.62

Balance at December 31, 2013
316,268

 
$
22.17

-
$
25.44

 
$
23.62
Calculated fair value of performance shares granted and major assumptions used in the Monte Carlo simulation
The estimated fair value of performance shares granted and major assumptions used in the simulation at the date of grant are listed below:
 
2013
 
2012
 
2011
 
Performance Share
Input Variables
Fair value of performance shares at grant date
$
39.62

 
$
25.42

 
$
18.23

Risk-free interest rate
0.40
%
 
0.35
%
 
1.32
%
Expected price volatility
19.0
%
 
22.0
%
 
31.3
%
Expected dividend yield
2.88
%
 
3.35
%
 
3.39
%
Expected life in years
2.9

 
2.9

 
2.9
Transactions involving performance shares under the terms of the LTSIP
Transactions involving performance shares under the terms of the LTSIP for the year ended December 31, 2013, are summarized below:
 
Target Number of Performance Shares Outstanding
 
Grant-Date
Fair Value Range
 
Weighted- Average Grant-Date Fair Value
Balance at December 31, 2012
264,867

 
$
18.23

-
$
25.42

 
$
21.94

Granted
126,606

 
39.62

 
39.62

 
39.62

Forfeited
(3,594
)
 
18.23

-
39.62

 
33.09

Balance at December 31, 2013
387,879

 
$
18.23

-
$
39.62

 
$
27.61
Questar Pipeline and Questar Gas [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options held under the LTSIP, by exercise price range
The following table summarizes the stock options held under the LTSIP by Questar Gas and Questar Pipeline officers and employees at December 31, 2013:
Options Outstanding
Options Exercisable
Range of
exercise
prices
 
Number outstanding at Dec. 31, 2013
 
Weighted-average remaining term in years
 
Weighted-average exercise price
 
Number exercisable at Dec. 31, 2013
 
Weighted-average exercise price
Questar Gas
 
 
 
 
 
 
 
 
 
 
$
11.40

-
$
13.10

 
17,000

 
2.6
 
$
12.10

 
17,000

 
$
12.10

Questar Pipeline
 
 
 
 
 
 
 
 
 
 
$
7.84

-
$
13.10

 
158,933

 
1.6
 
$
9.36

 
158,933

 
$
9.36
Transactions involving restricted shares and RSUs under the terms of the LTSIP
The following table summarizes the restricted shares held under the LTSIP by Questar Gas and Questar Pipeline officers and employees at December 31, 2013. The weighted-average remaining vesting periods of unvested restricted shares at December 31, 2013, for Questar Gas and Questar Pipeline were 6 months and 7 months, respectively.
 
Restricted
Shares Outstanding
 
Price Range
 
Weighted-Average Price
Questar Gas
58,837

 
$
13.10

-
$
19.39

 
$
18.60

Questar Pipeline
70,758

 
$
13.10

-
$
19.56

 
$
18.78


The following table summarizes the RSUs held under the LTSIP by Questar Gas and Questar Pipeline officers and employees at December 31, 2013. The weighted-average remaining vesting period of unvested RSUs at December 31, 2013, for Questar Gas and Questar Pipeline was 14 months.
 
RSUs Outstanding
 
Price Range
 
Weighted-Average Price
Questar Gas
55,631

 
$
22.17

-
$
23.62

 
$
23.54

Questar Pipeline
50,230

 
$
23.62

-
$
23.62

 
$
23.62
Transactions involving performance shares under the terms of the LTSIP
The following table summarizes the target number of performance shares held under the LTSIP by Questar Gas and Questar Pipeline officers at December 31, 2013. The weighted-average remaining vesting period of unvested performance shares at December 31, 2013, for Questar Gas and Questar Pipeline was 18 months.
 
Target Number of Performance Shares Outstanding
 
Grant-Date
Fair Value Range
 
Weighted- Average Grant-Date Fair Value
Questar Gas
34,326

 
$
18.23

-
$
39.62

 
$
27.91

Questar Pipeline
65,283

 
$
18.23

-
$
39.62

 
$
26.85