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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2014
Share-based Compensation [Abstract]  
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
(67,559
)
 
7.84

-
13.10

 
8.78

Balance at September 30, 2014
650,281

 
$
7.84

-
$
17.35

 
$
12.16
Options held under the LTSIP, by exercise price range
Options Outstanding
 
Options Exercisable
Range of exercise prices
 
Number outstanding at Sept. 30, 2014
 
Weighted-average remaining term in years
 
Weighted-average exercise price
 
Number exercisable at Sept. 30, 2014
 
Weighted-average exercise price
$
7.84

-
$
11.40

 
341,948

 
1.3
 
$
10.90

 
341,948

 
$
10.90

13.10

-
17.35

 
308,333

 
1.8
 
13.55

 
308,333

 
13.55

 
 
 
 
650,281

 
1.5
 
$
12.16

 
650,281

 
$
12.16
Transactions involving restricted shares and RSUs under the terms of the LTSIP
Transactions involving restricted shares under the terms of the LTSIP 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
(284,154
)
 
15.22

-
21.53

 
17.85

Forfeited
(661
)
 
19.39

-
20.90

 
20.00

Balance at September 30, 2014
107,512

 
$
15.98

-
$
21.53

 
$
19.41

Transactions involving RSUs under the terms of the LTSIP are summarized below:
 
RSUs
Outstanding
 
Price Range
 
Weighted-Average Price
Balance at December 31, 2013
316,268

 
$
22.17

-
$
25.44

 
$
23.62

Granted
353,540

 
22.81

-
24.70

 
23.60

Vested
(131,007
)
 
22.17

-
25.44

 
23.64

Forfeited
(10,225
)
 
23.60

-
23.62

 
23.60

Balance at September 30, 2014
528,576

 
$
22.17

-
$
24.70

 
$
23.60
Transactions involving performance shares under the terms of the LTSIP
Performance share transactions under the terms of the LTSIP 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
(5,660
)
 
25.42

-
39.62

 
33.06

Balance at September 30, 2014
394,069

 
$
25.42

-
$
39.62

 
$
31.80


 
(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.