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Stock-Based Compensation and Stock Awards (Tables)
 12 Months Ended
Dec. 31, 2016
Schedule of Option Activity
Option activity for the year ended December 31, 2016 was as follows:
 
Number of
Options
 
Weighted
Average
Price
 
Aggregate
intrinsic value
(in millions)
 
Weighted Average
Remaining
Contractual Life
(in years)
Outstanding at December 31, 2015
415,122

 
55.64

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(54,350
)
 
40.61

 
 
 
 
Forfeited
(8,813
)
 
67.71

 
 
 
 
Outstanding at December 31, 2016
351,959

 
$
57.66

 
$
2.5

 
3.5
Exercisable at December 31, 2016
351,959

 
$
57.66

 
$
2.5

 
3.5
Summary of RSA Activity
The Company’s RSA activity and related information is presented below:
 
RSA
Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
Per Share
Nonvested balance at December 31, 2015
193,596

 
$
77.91

Granted
165,063

 
48.45

Vested
(84,513
)
 
84.98

Forfeited
(4,763
)
 
80.60

Nonvested balance at December 31, 2016
269,383

 
$
57.59
Summary of PSA Activity
The Company’s Performance Unit activity and related information is presented below:
 
Number of
Performance
Units
 
Weighted
Average
Grant Date
Fair Value
Per
Unit
Nonvested balance at December 31, 2015
135,969

 
$
106.49

Granted
87,503

 
53.46

Vested
(27,253
)
 
138.31

Forfeited
—

 
—

Nonvested balance at December 31, 2016
196,219

 
$
78.42
Schedule of DSA Activity
The Company DSA activity for December 31, 2016 is presented below:
 
DSA Number of
Shares
 
Weighted
Average
Grant Date
Fair Value
Per
Share
Nonvested balance at December 31, 2015
6,162

 
$
71.77

Granted
8,174

 
58.47

Vested
(914
)
 
89.39

Forfeited
—

 
—

Nonvested balance at December 31, 2016
13,422

 
$
62.46
Schedule of Information for Stock Option Plans
The following table summarizes information for equity compensation plans in effect as of December 31, 2016:
 
Number of securities
to be issued upon
exercise of
outstanding options(1)
 
Weighted-average
exercise price of
outstanding options
 
Number of securities
remaining available for
future issuance under
equity compensation  plan
(excluding securities
reflected in column (a))
Plan category
(a)
 
(b)
 
(c)
Equity compensation plans approved by stockholders
 
 
 
 
 
Stock options
351,959

 
$
57.66

 
184,773

Equity compensation plans not approved by stockholders
—

 
—

 
—

Total
351,959

 
$
57.66

 
184,773

(1)
Excludes 282,805 shares of unvested RSAs and DSAs and 196,219 of unvested Performance Units, which were granted pursuant to the 2004 Plan approved by the stockholders.
Monte Carlo Simulation [Member]  
Schedule of Assumptions Used in Monte Carlo Simulation
Assumptions used in the Monte Carlo simulation are as follows:
 
2015
2016
Grant date
October 28, 2015
October 28, 2016
Performance period
October 1, 2015 to September 30, 2018
October 1, 2016 to September 30, 2019
Volatility
29.5%
32.5%
Risk-free interest rate
0.9795%
1.0100%
Grant date price
$65.72
$48.45