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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2015
Text Block [Abstract]  
Assumptions Used for Calculating Fair Values of Stock Option Awards
The fair value of share-based awards is determined at the time the awards are granted which is generally in January of each year, and requires judgment in estimating employee and market behavior. There were no stock options granted in 2015.
 
 
 
2015
 
2014
 
2013
Stock Options Granted:

 

 

Weighted average grant date fair value, per share
$
—

 
$
26.46

 
$
19.84

Weighted average assumptions used:

 

 

Expected volatility
—
%
 
52.8
%
 
66.4
%
Expected lives
0.0

 
5.0

 
4.9

Risk-free interest rates
—
%
 
1.7
%
 
0.8
%
Dividends yields
—
%
 
—
%
 
—
%
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, 2015
 
Shares
Under
Option
 
Weighted Avg.
Exercise
Prices
 
Weighted Avg.
Remaining
Life in Years
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
(Millions)
Outstanding Stock Options:

 

 

 

Outstanding, January 1, 2015
1,454,003

 
$
31.16

 
4.4
 
$
33

Canceled
(20,427
)
 
23.75

 

 

Exercised
(96,997
)
 
20.78

 

 
3

Outstanding, March 31, 2015
1,336,579

 
$
32.03

 
4.3
 
$
31

Forfeited
(7,531
)
 
47.36

 

 

Exercised
(141,644
)
 
14.68

 

 
6

Outstanding, June 30, 2015
1,187,404

 
$
34.00

 
4.2
 
$
30

Exercised
(749
)
 
19.48

 

 
—

Outstanding, September 30, 2015
1,186,655

 
$
33.99

 
3.9
 
$
19

Forfeited
(5,066
)
 
39.81

 

 

Exercised
(36,870
)
 
11.49

 

 
1

Outstanding, December 31, 2015
1,144,719


$
34.69

 
3.7
 
$
19
Nonvested Restricted Shares
The following table reflects the status for all nonvested restricted shares for the period indicated:
 
Year Ended December 31, 2015
 
Shares
 
Weighted Avg.
Grant Date
Fair Value
Nonvested Restricted Shares

 

Nonvested balance at January 1, 2015
286,051

 
$
42.35

Granted
350,101

 
53.40

Vested
(150,171
)
 
37.86

Nonvested balance at March 31, 2015
485,981

 
$
51.70

Granted
17,164

 
56.06

Vested
(13,008
)
 
46.37

Forfeited
(11,034
)
 
48.85

Nonvested balance at June 30, 2015
479,103

 
$
52.07

Granted
7,824

 
57.98

Vested
(14,948
)
 
49.98

Nonvested balance at September 30, 2015
471,979

 
$
52.15

Granted
32,264

 
44.24

Vested
(1,427
)
 
35.62

Forfeited
(5,974
)
 
54.76

Nonvested balance at December 31, 2015
496,842

 
$
51.65