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Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2014
 
2,077

 
$
16.92

Granted
 
561

(a)
45.80

Vested
 
(1,095
)
 
13.33

Surrendered
 
(58
)
 
25.49

Outstanding December 31, 2015
 
1,485

 
30.17

Granted
 
675

(b)
37.29

Vested
 
(665
)
 
23.29

Surrendered
 
(56
)
 
36.29

Outstanding December 31, 2016, Unvested
 
1,439

 
36.52

Granted
 
717

(c)
52.73

Vested
 
(806
)
 
30.23

Surrendered
 
(56
)
 
43.86

Outstanding December 31, 2017, Unvested
 
1,294

 
$
45.32


(a) Includes 183 thousand PBRSUs
(b) Includes 247 thousand PBRSUs
(c) Includes 235 thousand PBRSUs