Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value of Options Granted Calculated Using Weighted Average Assumptions

The fair value of options granted during the three month periods ended March 31, 2012 were calculated using the following weighted-average assumptions:

	Three Months Ended			Three Months Ended
	March 31, 2012			March 31, 2011
Options granted		46,950			-
Weighted average exercise price	$	41.27		$	-
Weighted-average grant date fair value	$	19.08			-
Assumptions:
Expected volatility		47.70	%		-
Expected term (in years)		5.9			-
Risk-free interest rate		1.43	%		-
Expected dividend yield		-			-

Summary of Activity Under Stock Option Plans

A summary of the activity under our stock option plans as of March 31, 2012 and changes during the three month period then ended, is presented below:

	Options Outstanding			Weighted-Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life in Years		Aggregate Intrinsic Value
Options outstanding at December 31, 2011		2,401,809		$	37.54		5.0	$	12,195,931
Options granted		46,950			41.27
Options exercised		(3,960	)		28.95
Options cancelled		(3,800	)		47.19
Options outstanding at March 31, 2012		2,440,999			37.59		4.9		14,667,018
Options exercisable at March 31, 2012		1,601,981			42.12		3.4		5,404,008
Options vested or expected to vest at March 31, 2012*		2,413,888			37.71		4.9		14,389,127

* In addition to the vested options, we expect a portion of the unvested options to vest at some point in the future.  Options expected to vest are calculated by applying an estimated forfeiture rate to the unvested options.

Performance-Based Restricted Stock

Restricted Stock Activities

	Performance Based Restricted Stock Awards
Non-vested awards outstanding at December 31, 2011		101,730
Awards granted		22,120
Stock issued		(43,750	)
Awards forfeited		(6,642	)
Non-vested awards outstanding at  March 31, 2012		73,458

Time Based Restricted Stock

Restricted Stock Activities

	Time Based Restricted Stock Awards
Non-vested awards outstanding at December 31, 2011		86,707
Awards granted		45,460
Stock issued		-
Awards forfeited		(4,035	)
Non-vested awards outstanding at  March 31, 2012		128,132

Deferred Stock Units

Restricted Stock Activities

	Deferred Stock Units
Non-vested awards outstanding at December 31, 2011		27,350
Awards granted		-
Stock issued		-
Awards forfeited		-
Non-vested awards outstanding at  March 31, 2012		27,350