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Stock Incentive Plan (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation [Abstract]  
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value
The weighted average grant-date fair value of performance awards granted under the 2006 Plan during 2014, 2013 and 2012 was as follows:
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
Weighted average grant-date fair value
 
$
53.87

 
$
51.51

 
$
52.11
Share-based compensation arrangement by share-based payment award, equity instruments other than options, earned and issued
Based on the level of performance achieved as of December 31, 2014 and 2013, the following shares were earned under the related performance period and issued in the subsequent year, net of shares that were withheld for taxes related to the earned awards:
 
 
Years Ended December 31,
 
 
 
2014
 
2013
 
Shares earned at year-end
 
286,804

 
622,018

 
Shares withheld for taxes on the earned awards
 
113,334

 
226,721

 
Shares issued subsequent to year-end, net
 
173,470

 
395,297

(1) 

____________________________________
(1) 26,800 shares were issued during 2013.
Performance Award Transactions
Performance award transactions during 2014 were as follows and are presented as if the Company were to achieve its maximum levels of performance under the plan:
Shares awarded but not earned at January 1
2,808,519

Shares awarded
887,198

Shares forfeited or unearned
(317,684
)
Shares earned
(896,266
)
Shares awarded but not earned at December 31
2,481,767
Weighted Average Grant-Date Fair Value Of SSARS And Assumptions Under Black-Scholes Option Model
The weighted average grant-date fair value of SSARs granted under the 2006 Plan and the weighted average assumptions under the Black-Scholes option model were as follows for the years ended December 31, 2014, 2013 and 2012:
 
Years Ended December 31,
 
2014
 
2013
 
2012
Weighted average grant-date fair value
$
13.11

 
$
21.10

 
$
22.50

Weighted average assumptions under Black-Scholes option model:
 

 
 

 
 

Expected life of awards (years)
3.0

 
5.5

 
5.5

Risk-free interest rate
0.9
%
 
0.9
%
 
0.8
%
Expected volatility
35.7
%
 
50.3
%
 
51.0
%
Expected dividend yield
0.8
%
 
0.8
%
 
—
SSAR Activity
SSAR transactions during the year ended December 31, 2014 were as follows:
SSARs outstanding at January 1
1,094,836

SSARs granted
301,400

SSARs exercised
(112,050
)
SSARs canceled or forfeited
(63,362
)
SSARs outstanding at December 31
1,220,824

SSAR price ranges per share:
 

Granted
$ 52.85 - 55.23

Exercised
21.45 - 52.94

Canceled or forfeited
21.45 - 56.98

Weighted average SSAR exercise prices per share:
 

Granted
$
55.20

Exercised
23.08

Canceled or forfeited
53.31

Outstanding at December 31
50.31
Schedule Of SSAR Exercise Price Range, Number Of Shares, Weighted Average Exercise Price And Remaining Contractual Lives
The following table sets forth the exercise price range, number of shares, weighted average exercise price, and remaining contractual lives by groups of similar price as of December 31, 2014:
 
 
SSARs Outstanding
 
SSARs Exercisable
Range of Exercise Prices
 
Number of
Shares
 
Weighted Average
Remaining
Contractual Life
(Years)
 
Weighted Average
Exercise Price
 
Exercisable as of December 31, 2014
 
Weighted Average
Exercise Price
$21.45 - $32.01
 
56,625

 
1.2
 
$
22.64

 
56,625

 
$
22.64

$33.65 - $43.39
 
125,525

 
2.1
 
$
33.88

 
124,800

 
$
33.82

$47.89 - $63.64
 
1,038,674

 
4.5
 
$
53.80

 
414,652

 
$
53.56

 
 
1,220,824

 
 
 
 
 
596,077

 
$
46.49