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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Text Block [Abstract]  
Stock Options Status and Activity
The following table reflects the status and activity for all options to purchase common stock for the period indicated:
 
Year Ended December 31, 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

Forfeited
(628
)
 
62.54

 

 

Exercised
(24,683
)
 
40.86

 

 
—

Outstanding, December 31, 2017
318,016


$
43.60

 
2.3
 
$
5
Nonvested Restricted Shares
The following table reflects the status for all nonvested restricted shares for the period indicated:
 
Year Ended December 31, 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

Vested
(19,228
)
 
47.45

Forfeited
(6,997
)
 
51.79

Nonvested balance at December 31, 2017
410,251

 
$
49.95