Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table summarizes the assumptions used in estimating the fair value of these awards:

	Stock Price on Measurement Date		Dividend Yield		Expected Volatility		Risk Free Interest Rate		Expected Term	Weighted Avg. Grant Date Fair Value
2015	$	97.48	2.6	%	23.3	%	1.3	%	3 years	$	87.61
2014	$	106.44	2.1	%	22.7	%	1.0	%	3 Years	$	95.96

Schedule of Activity Related to Employee and Non-Employee Restricted Stock

Activity related to both employee and non-employee restricted stock for the year ended December 31, 2015 is as follows (in thousands, except per share amounts):

	Shares		Weighted Average Grant Date Fair Value/Share
RESTRICTED STOCK AT DECEMBER 31, 2014	167		$	102.22
Shares granted	96		96.26
Shares vested	(77	)	99.91
Shares forfeited	(7	)	103.46
RESTRICTED STOCK AT DECEMBER 31, 2015	179		$	99.97

Summary of Stock Appreciation Rights

Activity related to SARs for the year ended December 31, 2015 is as follows (in thousands, except per share amounts):

	Number of Rights		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value
OUTSTANDING AT DECEMBER 31, 2014	1,465		$	78.64
Granted	364		97.87
Exercised	(102	)	59.37
Forfeited	(14	)	104.07
Canceled	(9	)	59.50
OUTSTANDING AT DECEMBER 31, 2015	1,704		$	83.77	7.2	$	32,492
EXERCISABLE AT DECEMBER 31, 2015	1,101		$	74.04	6.1	$	31,237

Summary of the Weighted-Average Assumption Used in Estimating Fair Value of Stock Appreciation Rights

The following table summarizes the weighted-average assumptions used in estimating the fair value of the SARs granted during the years 2015, 2014, and 2013:

	Expected Dividend Yield		Expected Volatility		Risk Free Interest Rate		Expected Term	Weighted Avg. Grant Date Fair Value of 1 SAR
2015	2.7	%	22.7	%	1.7	%	5.5 Years	$	16.05
2014	2.0	%	21.8	%	1.6	%	5.3 Years	$	18.42
2013	1.9	%	28.3	%	1.6	%	5.4 Years	$	24.58

Summary of Performance Shares Valuation

The following table summarizes the related assumptions used to determine the fair values of the market performance share awards granted during the years 2015, 2014, and 2013:

	Stock Price on Measurement Date		Dividend Yield		Expected Volatility		Risk Free Interest Rate		Expected Term	Weighted Avg. Grant Date Fair Value
2015	$	97.48	2.6	%	23.3	%	1.3	%	3 Years	$	105.77
2014	$	106.44	2.1	%	22.7	%	1.0	%	3 Years	$	117.55
2013	$	107.87	1.9	%	33.8	%	0.6	%	3 Years	$	130.33

Summary of the Attributes of the Performance Shares Granted During the Period

The following table summarizes the attributes of the performance shares granted during 2015 and 2014:

Year of Grant	Shares Outstanding at 12/31/2015	Fair Value	Performance Period	Payout Range
2015	32,687	97.48	Jan 2016-Dec 2018	0-250%
2014	24,993	106.44	Jan 2015-Dec 2017	0-250%