Stock-Based Compensation and Stock Awards (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Option Activity

Option activity for the year ended December 31, 2015 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, 2014		459,247			55.86
Granted		—			—
Exercised		(38,500	)		56.37
Forfeited		(5,625	)		68.23
Outstanding at December 31, 2015		415,122		$	55.64	$	3.4		4.2
Exercisable at December 31, 2015		415,122		$	55.64	$	3.4		4.2

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, 2014		160,154		$	93.78
Granted		123,224			66.02
Vested		(79,797	)		89.10
Forfeited		(9,985	)		96.29
Nonvested balance at December 31, 2015		193,596		$	77.91

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, 2014		123,786		$	113.98
Granted		67,346			79.25
Vested		(48,086	)		84.66
Forfeited		(3,478	)		114.50
Nonvested balance at December 31, 2015		139,568		$	107.31

Schedule of DSA Activity

The Company DSA activity for December 31, 2015 is presented below:

	DSA Number of Shares			Weighted Average Grant Date Fair Value Per Share
Nonvested balance at December 31, 2014		1,204		$	89.40
Granted		6,843			68.73
Vested		(1,885	)		72.00
Forfeited		—			—
Nonvested balance at December 31, 2015		6,162		$	71.77

Schedule of Information for Stock Option Plans

The following table summarizes information for equity compensation plans in effect as of December 31, 2015:

	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		415,122	$	55.64		441,914
Equity compensation plans not approved by stockholders		—		—		—
Total		415,122	$	55.64		441,914

(1) Excludes 199,758 shares of unvested RSAs and DSAs and 139,568 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:

	2014	2015
Grant date	October 28, 2014	October 28, 2015
Performance period	October 1, 2014 to September 30, 2017	October 1, 2015 to September 30, 2018
Volatility	27.8%	29.5%
Risk-free interest rate	0.8081%	0.9795%
Grant date price	$91.02	$65.72