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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2014
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.
 
 
 
2014
 
2013
 
2012
Stock Options Granted:

 

 

Weighted average grant date fair value, per share
$
26.46

 
$
19.84

 
$
17.35

Weighted average assumptions used:

 

 

Expected volatility
52.8
%
 
66.4
%
 
73.5
%
Expected lives
5.0

 
4.9

 
4.7

Risk-free interest rates
1.7
%
 
0.7
%
 
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, 2014
 
Shares
Under
Option
 
Weighted Avg.
Exercise
Prices
 
Weighted Avg.
Remaining
Life in Years
 
Aggregate
Intrinsic
Value
 
 
 
 
 
 
 
(Millions)
Outstanding Stock Options:

 

 

 

Outstanding, January 1, 2014
1,983,573

 
$
22.93

 
4.5
 
$
62

Granted
192,624

 
56.23

 

 

Canceled
(31,299
)
 
19.78

 

 

Forfeited
(300
)
 
22.77

 

 

Exercised
(25,595
)
 
14.72

 

 
1

Outstanding, March 31, 2014
2,119,003

 
$
26.10

 
4.6
 
$
67

Granted
—

 
—

 

 

Forfeited
—

 
—

 

 

Exercised
(32,233
)
 
25.49

 

 
1

Outstanding, June 30, 2014
2,086,770

 
$
26.11

 
4.3
 
$
75

Granted
834

 
66.54

 

 

Canceled
(526
)
 
36.00

 

 

Forfeited
(1,535
)
 
29.72

 

 

Exercised
(12,358
)
 
23.81

 

 
—

Outstanding, September 30, 2014
2,073,185

 
$
26.13

 
4.1
 
$
77

Granted
—

 
—

 

 

Canceled
—

 
—

 

 

Forfeited
(12,182
)
 
47.36

 

 

Exercised
(607,000
)
 
13.66

 

 
24

Outstanding, December 31, 2014
1,454,003


$
31.16

 
4.4
 
$
33
Nonvested Restricted Shares
The following table reflects the status for all nonvested restricted shares for the period indicated:
 
Year Ended December 31, 2014
 
Shares
 
Weighted Avg.
Grant Date
Fair Value
Nonvested Restricted Shares

 

Nonvested balance at January 1, 2014
368,268

 
$
34.90

Granted
131,561

 
54.90

Vested
(186,112
)
 
36.57

Forfeited
—

 
—

Nonvested balance at March 31, 2014
313,717

 
$
42.30

Granted
2,838

 
66.96

Vested
(2,286
)
 
31.63

Forfeited
(575
)
 
38.52

Nonvested balance at June 30, 2014
313,694

 
$
42.60

Granted
1,160

 
67.02

Vested
(10,664
)
 
55.36

Forfeited
—

 
—

Nonvested balance at September 30, 2014
304,190

 
$
42.25

Granted
—

 
—

Vested
(11,040
)
 
36.37

Forfeited
(7,099
)
 
47.37

Nonvested balance at December 31, 2014
286,051

 
$
42.35