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Stock-Based Compensation and Stock Awards (Tables)
 12 Months Ended
Dec. 31, 2017
Schedule of Option Activity
Option activity for the year ended December 31, 2017 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, 2016
351,959


$
57.66





Granted
—


—





Exercised
(23,247
)

31.31




Forfeited
(48,500
)

57.71




Outstanding at December 31, 2017
280,212


$
59.84


$
0.6


2.9
Exercisable at December 31, 2017
280,212


$
59.84


$
0.6


2.9
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, 2016
269,383


$
57.59

Granted
261,095


43.56

Vested
(127,674
)

55.31

Forfeited
(5,506
)

52.81

Nonvested balance at December 31, 2017
397,298


$
46.76
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, 2016
196,219

 
$
78.42

Granted
122,810

 
54.64
Vested
(52,444
)
 
126.84
Forfeited
(2,311
)
 
126.84
Nonvested balance at December 31, 2017
264,274

 
$
59.97
Schedule of DSA Activity
The Company's DSA activity for the year ended December 31, 2017 is presented below:

DSA Number of Shares
 
Weighted Average Grant Date Fair Value Per Share
Nonvested balance at December 31, 2016
13,422

 
$
62.46

Granted
9,340

 
51.58

Vested
(5,248
)
 
68.70

Forfeited
—

 
—

Nonvested balance at December 31, 2017
17,514

 
$
54.80
Schedule of Information for Stock Option Plans
The following table summarizes information for equity compensation plans in effect as of December 31, 2017:

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
280,212


$
59.84


198,472

Total
280,212


$
59.84


198,472

(1)
Excludes 414,812 shares of unvested RSAs and DSAs and 264,274 of unvested Performance Units, which were granted pursuant to the 2017 Plan and the 2004 Plan, both of which were approved by the stockholders.
Monte Carlo Simulation  
Schedule of Assumptions Used in Monte Carlo Simulation
Assumptions used in the Monte Carlo simulation are as follows:

2017

2016
Grant date
October 28, 2017

October 28, 2016
Performance period
October 1, 2017 to September 30, 2020

October 1, 2016 to September 30, 2019
Volatility
34.0%

32.5%
Risk-free interest rate
1.7%

1.0%
Grant date price
$41.50

$48.45