Equity Compensation (Tables)

9 Months Ended

Sep. 30, 2011

Equity Compensation [Abstract]

Schedule Of Stock-Based Compensation Expense And Related Income Tax Benefit Recognized In Condensed Consolidated Statements Of Income

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Stock-based compensation expense		$4,166		$3,708		$12,838		$12,707
Income tax (benefit)		($1,604)		($1,428)		($4,943)		($4,893)

Stock Options Granted, Forfeited, Exercised And Expired

	Nine Months Ended September 30, 2011
	# of Shares		Weighted Average Exercise Price		Aggregate Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
Outstanding at beginning of period		1,724,791		$77.95		$134,447
Granted		159,500		$69.43		11,074
Forfeited		0		$0		0
Exercised		(112,110)		$47.15		(5,286)
Expired		0		$0		0
Outstanding at end of period		1,772,181		$79.13		$140,235	3.8		$7,941
Exercisable at end of period		1,326,000		$72.38		$95,970	3.1		$7,941

(1) The aggregate intrinsic value of the stock options was calculated by identifying those stock options that had a lower exercise price than the closing market price of our common stock on September 30, 2011 and multiplying the difference between the closing market price of our common stock and the exercise price of each of those stock options by the number of shares subject to those stock options that were outstanding or exercisable, as applicable.

Stock Options Granted And Exercised

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Shares subject to stock options granted		0		0		159,500		305,000
Weighted average grant date fair value per share		$0		$0		$28.90		$43.59
Shares subject to stock options exercised		8,800		101,550		112,110		172,879
Intrinsic value of stock options exercised		$469		$3,410		$3,039		$8,582
Proceeds received from stock options exercised		$303		$5,210		$5,286		$7,830
Tax benefits realized from stock options exercised		$180		$1,313		$1,169		$3,255

Fair Value Of Stock Option Grant

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Risk-free interest rates		Not applicable		Not applicable		1.8%		2.2%
Expected lives (in years)		Not applicable		Not applicable		4.7		4.6
Volatility		Not applicable		Not applicable		48%		43%
Dividend yield		Not applicable		Not applicable		None		None

Number Of Restricted Stock Units Granted, Forfeited And Vested

	Nine Months Ended September 30, 2011
	# of RSUs		Weighted Average Grant Date Fair Value
Unvested at beginning of period		128,803		$99.22
Granted		249,575		$70.05
Forfeited		(19,441)		$83.93
Vested		(36,321)		$82.21
Unvested at end of period		322,616		$79.49