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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Information with Respect to Stock Option Activity
Information with respect to stock option activity for 2017 is as follows:
 
Shares
(in thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2016
5,109

 
$
28.88

 
5.6
 
 
Granted
330

 
36.72

 
 
 
 
Exercised
(2,101
)
 
28.76

 
 
 
 
Forfeited
(126
)
 
31.09

 
 
 
 
Outstanding at December 31, 2017
3,212

 
$
29.66

 
5.4
 
$
54,493

Exercisable at December 31, 2017
2,527

 
$
28.95

 
4.6
 
$
44,663

Vested and expected to vest at December 31, 2017
3,178

 
$
29.63

 
5.4
 
$
54,001
Information with Respect to Restricted Stock Unit Activity
Information with respect to restricted stock unit activity for 2017 is as follows:
 
Shares
(in thousands)
 
Weighted 
Average Grant
Date Fair Value
Outstanding at December 31, 2016
1,930

 
$
30.92

Granted
1,057

 
35.89

Vested and distributed
(748
)
 
36.62

Forfeited
(226
)
 
30.41

Outstanding at December 31, 2017
2,013

 
$
31.86