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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Stock Based Compensation Expense

	Year ended December 31,
	2015			2014			2013
Stock-based compensation expense	$	59,465		$	97,618		$	64,781
Stock-based compensation expense, net of tax		36,666			60,084			39,465
Stock-based compensation expense recognized as capitalized development		1,554			1,178			1,124

Summary Of Option And SOSAR Activity Under Incentive Plan

	2015					2014					2013
	Shares		Weighted-Average Exercise Price Per Share			Shares		Weighted-Average Exercise Price Per Share			Shares		Weighted-Average Exercise Price Per Share
Outstanding, beginning of year	2,087		$	395.46		1,690		$	312.44		1,449		$	274.92
Granted	379		$	659.12		764		$	545.66		672		$	320.21
Exercised	(716)		$	297.25		(315)		$	310.32		(369)		$	176.23
Forfeited	(56)		$	554.73		(52)		$	419.74		(62)		$	329.76
Outstanding, end of year	1,694		$	490.70		2,087		$	395.46		1,690		$	312.44

	Shares		Weighted-Average Exercise Price Per Share			Weighted-Average Remaining Years of Contractual Life		Aggregate Intrinsic Value
Outstanding as of December 31, 2015	1,694		$	490.70		4.9		$	92,773
Vested and expected to vest as of December 31, 2015	1,640		$	486.10		4.8		$	92,622
Exercisable as of December 31, 2015	321		$	339.72		3.5		$	45,112

Summary Of Non-Vested Stock Award Activity Under Incentive Plan

	2015					2014					2013
	Shares		Grant Date Fair Value Per Share			Shares		Grant Date Fair Value Per Share			Shares		Grant Date Fair Value Per Share
Outstanding, beginning of year	70		$	525.60		71		$	520.27		120		$	218.34
Granted	47		$	785.32		2		$	495.92		68		$	527.45
Vested	(1)		$	413.07		(2)		$	284.11		(117)		$	215.76
Forfeited	-		$	534.55		(1)		$	410.55		—		$	—
Outstanding, end of year	116		$	511.88		70		$	525.60		71		$	520.27

Performance Shares [Member]

Schedule Of Assumptions to Value SOSAR or Stock Awards Granted

										2015
Risk-free interest rate											1.0	%
Expected life (years)											2.9
Expected dividend yield											0.0	%
Volatility											33.7	%

SOSARS [Member]

Schedule Of Assumptions to Value SOSAR or Stock Awards Granted

		2015				2014				2013
Risk-free interest rate			1.1	%			0.8	%			0.5	%
Expected life (years)			3.4				3.4				3.4
Expected dividend yield			0.0	%			0.0	%			0.0	%
Volatility			30.8	%			33.3	%			35.4	%
Weighted-average Black-Scholes fair value per share at date of grant		$	156.32			$	136.18			$	82.51

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- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References

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Tabular disclosure of the changes in outstanding nonvested shares.

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