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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Transactions involving stock options under the terms of the LTSIP
Stock option transactions and balances under the terms of the LTSIP are summarized below:
 
Options Outstanding
 
Exercise Price Range
 
Weighted-Average Exercise Price
Balance at December 31, 2013
717,840

 
$
7.84

-
$
17.35

 
$
11.84

Exercised
(282,333
)
 
7.84

-
13.24

 
10.88

Balance at December 31, 2014
435,507

 
$
11.40

-
$
17.35

 
$
12.46
Options held under the LTSIP, by exercise price range
Options Outstanding
 
Options Exercisable
Range of exercise prices
 
Number outstanding at Dec. 31, 2014
 
Weighted-average remaining term in years
 
Weighted-average exercise price
 
Number exercisable at Dec. 31, 2014
 
Weighted-average exercise price
$
11.40

 
$
11.40

 
239,174

 
1.2
 
$
11.40

 
239,174

 
$
11.40

$
13.10

-
17.35

 
196,333

 
2.0
 
13.75

 
196,333

 
13.75

 

 
 
 
435,507

 
1.5
 
$
12.46

 
435,507

 
$
12.46
Transactions involving restricted shares and RSUs under the terms of the LTSIP
Transactions involving RSUs under the terms of the LTSIP for the year ended December 31, 2014, are summarized below:
 
RSUs Outstanding
 
Price Range
 
Weighted-Average Price
Balance at December 31, 2013
316,268

 
$
22.17

-
$
25.44

 
$
23.62

Granted
351,066

 
22.14

-
24.70

 
23.59

Vested
(131,007
)
 
22.17

-
25.44

 
23.64

Forfeited
(10,225
)
 
23.60

-
23.62

 
23.60

Balance at December 31, 2014
526,102

 
$
22.14

-
$
24.70

 
$
23.60

Transactions involving restricted shares under the terms of the LTSIP for the year ended December 31, 2014, are summarized below:
 
Restricted Shares Outstanding
 
Price Range
 
Weighted- Average Price
Balance at December 31, 2013
392,327

 
$
15.22

-
$
21.53

 
$
18.28

Vested
(289,312
)
 
15.22

-
21.53

 
17.88

Forfeited
(661
)
 
19.39

-
20.90

 
20.00

Balance at December 31, 2014
102,354

 
$
17.97

-
$
21.53

 
$
19.41
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:
 
2014
 
2013
 
2012
 
Performance Share Input Variables
Fair value of performance shares at grant date
$
31.07

 
$
39.62

 
$
25.42

Risk-free interest rate
0.67
%
 
0.40
%
 
0.35
%
Expected price volatility
18.6
%
 
19.0
%
 
22.0
%
Expected dividend yield
3.05
%
 
2.88
%
 
3.35
%
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, 2014, are summarized below:
 
Target Number of Performance Shares Outstanding
 
Grant-Date Fair Value Range
 
Weighted-Average Grant-Date Fair Value
Balance at December 31, 2013
387,879

 
$
18.23

-
$
39.62

 
$
27.61

Granted
139,611

 
31.07

 
31.07

 
31.07

Payout adjustment(1)
(76,657
)
 
18.23

 
18.23

 
18.23

Distributed(1)
(51,104
)
 
18.23

 
18.23

 
18.23

Forfeited
(8,480
)
 
25.42

-
39.62

 
33.33

Balance at December 31, 2014(2),(3)
391,249

 
$
25.42

-
$
39.62

 
$
31.78



(1) Actual shares and cash distributed were determined by multiplying the target shares by 0.40 to reflect Questar's final total shareholder return ranking relative to the specified peer companies for the performance period from January 1, 2011 through December 31, 2013. The total amount paid for the cash half of the distribution was $0.6 million.

(2) The total undistributed balance consists of 262,979 of share-settled target shares and 128,270 of cash-settled target shares.

(3) The total undistributed balance includes 134,778 vested target shares that are expected to be distributed in the first quarter of 2015 using a payout adjustment multiplier of 1.00. The multiplier reflects Questar's final total shareholder return ranking relative to the specified peer companies for the performance period from January 1, 2012 through December 31, 2014. The distribution will be half in shares, half in cash. These target shares are included in the amounts described in note (2), immediately above.
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 Pipeline officers and employees at December 31, 2014. There were no stock options held under the LTSIP by Questar Gas officers or employees at December 31, 2014.
Options Outstanding
Options Exercisable
Range of exercise prices
 
Number outstanding at Dec. 31, 2014
 
Weighted-average remaining term in years
 
Weighted-average exercise price
 
Number exercisable at Dec. 31, 2014
 
Weighted-average exercise price
Questar Pipeline
 
 
 
 
 
 
 
 
 
 
$
11.40

-
$
13.10

 
58,933

 
1.5
 
$
11.95

 
58,933

 
$
11.95
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, 2014. The weighted-average remaining vesting periods of unvested restricted shares at December 31, 2014, for Questar Gas and Questar Pipeline were 2 months and 3 months, respectively.
 
Restricted
Shares Outstanding
 
Price Range
 
Weighted-Average Price
Questar Gas
12,635

 
$
19.39

 
$
19.39

 
$
19.39

Questar Pipeline
25,269

 
$
19.39

-
$
19.56

 
$
19.42


The following table summarizes the RSUs held under the LTSIP by Questar Gas and Questar Pipeline officers and employees at December 31, 2014. The weighted-average remaining vesting period of unvested RSUs at December 31, 2014, for Questar Gas and Questar Pipeline was 12 months.
 
RSUs Outstanding
 
Price Range
 
Weighted-Average Price
Questar Gas
82,351

 
$
23.09

-
$
23.62

 
$
23.61

Questar Pipeline
95,841

 
$
23.09

-
$
23.62

 
$
23.59
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, 2014. The weighted-average remaining vesting period of unvested performance shares at December 31, 2014, 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
33,826

 
$
25.42

-
$
39.62

 
$
31.73

Questar Pipeline
59,956

 
$
25.42

-
$
39.62

 
$
31.59