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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Options Activity
 
Shares under option
(thousands)
 
Weighted average exercise price
 
Weighted average remaining contractual life
(in years)
 
Aggregate intrinsic value
(in millions)
Outstanding and exercisable at December 31, 2016
473

 
$
17.47

 
0.1
 
$
10.4

Exercised
(473
)
 
$
17.47

 
 
 

Outstanding and exercisable at September 30, 2017
—

 


 

 
Nonvested Restricted Stock Activity
 
Shares subject to restriction
(thousands)
 
Weighted average price
Nonvested at December 31, 2016
1,429

 
$
44.12

Granted
777

 
$
40.07

Vested
(453
)
 
$
57.35

Forfeited
(28
)
 
$
41.87

Nonvested at March 31, 2017
1,725

 
$
39.27

Granted
27

 
$
41.13

Vested
(61
)
 
$
51.71

Forfeited
(28
)
 
$
38.06

Nonvested at June 30, 2017
1,663

 
$
38.86

Vested
(7
)
 
$
45.09

Forfeited
(19
)
 
$
38.22

Nonvested at September 30, 2017
1,637

 
$
38.85