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SHARE-BASED PAYMENTS (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Payments [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Activity
The following tables set forth activity and various statistics for restricted stock unit awards outstanding under the respective plans for the period indicated:
 
 
ONE Gas Plan
 
ONEOK Plans
 
 
Number of
Shares
 
Weighted-
Average Price
 
Number of
Shares
 
Weighted-
Average Price
Nonvested December 31, 2013
 
—

 
$
—

 
137,670

 
$
34.57

Released to participants prior to separation
 
—

 
$
—

 
(66,960
)
 
$
28.50

Cancelled and replaced upon separation
 
246,683

 
$
19.71

 
(70,710
)
 
$
40.31

Granted
 
94,865

 
$
33.19

 
—

 
$
—

Released to participants
 
(7,217
)
 
$
19.85

 
—

 
$
—

Forfeited
 
(8,601
)
 
$
25.76

 
—

 
$
—

Nonvested December 31, 2014
 
325,730

 
$
23.47

 
—

 
$
—

 
 
2014
 
2013
 
2012
Weighted-average grant date fair value (per share)
 
$
33.19

 
$
47.36

 
$
36.60

Fair value of shares granted (thousands of dollars)
 
$
3,149

 
$
1,323

 
$
2,046
Schedule of Nonvested Performance-based Units Activity
The following tables set forth activity and various statistics related to our performance stock unit awards and the assumptions used by us, and ONEOK prior to 2014, in the valuations of the 2014, 2013 and 2012 grants at the grant date:
 
 
ONE Gas Plan
 
ONEOK Plans
 
 
Number of
Units
 
Weighted-
Average Price
 
Number of
Units
 
Weighted-
Average Price
Nonvested December 31, 2013
 
—

 
$
—

 
264,537

 
$
40.45

Released to participants prior to separation
 
—

 
$
—

 
(128,458
)
 
$
34.68

Cancelled and replaced upon separation
 
739,521

 
$
14.57

 
(136,079
)
 
$
45.90

Granted
 
124,015

 
$
35.98

 
—

 
$
—

Forfeited
 
(15,585
)
 
$
19.15

 
—

 
$
—

Nonvested December 31, 2014
 
847,951

 
$
17.62

 
—

 
$
—

 
 
2014
 
2013
 
2012
 
Volatility
 
18.40%
(a)
22.27%
(b)
27.00%
(b)
Dividend yield
 
3.37%
 
3.04%
 
2.86%
 
Risk-free interest rate
 
0.67%
 
0.42%
 
0.38%
 
(a) - Volatility based on historical volatility over three years using daily stock price observations of our peer utilities.
 
(b) - Volatility based on historical volatility over three years using daily ONEOK stock price observations.
 
 
 
2014
 
2013
 
2012
Weighted-average grant date fair value (per share)
 
$
35.98

 
$
52.30

 
$
42.39

Fair value of shares granted (thousands of dollars)
 
$
4,462

 
$
2,926

 
$
4,286