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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information with Respect to Stock Option Activity
Information with respect to stock option activity for 2018 is as follows:
 
Shares
(in thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2017
3,212

 
$
29.66

 
5.4
 
 
Granted
—

 
—

 
 
 
 
Exercised
(959
)
 
29.47

 
 
 
 
Forfeited
(97
)
 
31.16

 
 
 
 
Outstanding at December 31, 2018
2,156

 
$
29.67

 
4.7
 
$
29,903

Exercisable at December 31, 2018
1,970

 
$
29.28

 
4.4
 
$
28,091

Vested and expected to vest at December 31, 2018
2,147

 
$
29.66

 
4.7
 
$
29,812
Information with Respect to Restricted Stock Unit Activity
Information with respect to restricted stock unit activity for 2018 is as follows:
 
Shares
(in thousands)
 
Weighted 
Average Grant
Date Fair Value
Outstanding at December 31, 2017
2,013

 
$
31.86

Granted
771

 
52.83

Vested
(812
)
 
31.17

Forfeited
(221
)
 
34.47

Outstanding at December 31, 2018
1,751

 
$
40.77