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Common Stock (Tables)
9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Options Status and Activity
Stock Options — The following table reflects the status and activity for all options to purchase common stock for the period indicated:
 
Nine Months Ended September 30, 2017
 
Shares
Under
Option
 
Weighted Avg.
Exercise
Prices
 
Weighted Avg.
Remaining
Life in Years
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
(Millions)
Outstanding Stock Options
 
 
 
 
 
 
 
Outstanding, January 1, 2017
606,525

 
$
38.54

 
2.6
 
$
12

Canceled
(2,214
)
 
56.23

 
 
 

Forfeited
(1,107
)
 
56.23

 
 
 

Exercised
(164,863
)
 
33.70

 
 
 
5

Outstanding, March 31, 2017
438,341

 
$
40.22

 
2.6
 
$
11

Forfeited
(278
)
 
66.54

 
 
 

Exercised
(3,242
)
 
45.42

 
 
 

Outstanding, June 30, 2017
434,821

 
$
40.16

 
2.4
 
$
8

Forfeited
(41,369
)
 
19.53

 
 
 

Exercised
(50,125
)
 
34.79

 
 
 
1

Outstanding, September 30, 2017
343,327

 
$
43.44

 
2.4
 
$
4

 
 
 
 
 
 
 
 
Nonvested Restricted Shares
Restricted Stock — The following table reflects the status for all nonvested restricted shares for the period indicated:
 
Nine Months Ended September 30, 2017
 
Shares
 
Weighted Avg.
Grant Date
Fair Value
Nonvested Restricted Shares
 
 
 
Nonvested balance at January 1, 2017
591,416

 
$
44.63

Granted
182,543

 
68.04

Vested
(261,003
)
 
50.95

Forfeited
(65,354
)
 
53.12

Nonvested balance at March 31, 2017
447,602

 
$
49.25

Granted
23,295

 
57.22

Vested
(15,336
)
 
46.77

Forfeited
(6,271
)
 
48.10

Nonvested balance at June 30, 2017
449,290

 
$
49.79

Granted
2,001

 
55.80

Vested
(4,581
)
 
55.52

Forfeited
(10,234
)
 
44.82

Nonvested balance at September 30, 2017
436,476

 
$
49.87