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Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
Aggregated information regarding the Company’s RSUs and PBRSUs is summarized below:
 
 
 
All Restricted Stock Units
 
 
Units (000)    
 
Wtd. Average
Fair Value
(per share)
Outstanding December 31, 2013, Unvested
 
2,584

 
$
11.38

Granted
 
834

(a)
24.93

Vested
 
(1,239
)
 
11.05

Surrendered
 
(102
)
 
13.18

Outstanding December 31, 2014
 
2,077

 
16.92

Granted
 
561

(b)
45.80

Vested
 
(1,095
)
 
13.33

Surrendered
 
(58
)
 
25.49

Outstanding December 31, 2015
 
1,485

 
30.17

Granted
 
675

(c)
37.29

Vested
 
(665
)
 
23.29

Surrendered
 
(56
)
 
36.29

Outstanding December 31, 2016, Unvested
 
1,439

 
$
36.52


(a) Includes 198 thousand PBRSUs
(b) Includes 183 thousand PBRSUs
(c) Includes 247 thousand PBRSUs