Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value of Options Granted Calculated Using Weighted Average Assumptions

The fair value of options granted during the three and six month periods ended June 30, 2012 and 2011 were calculated using the following weighted-average assumptions:

	Three Months Ended					Six Months Ended
	June 30, 2012		June 30, 2011			June 30, 2012			June 30, 2011
Options granted		-		58,550			46,950			58,550
Weighted average exercise price	$	-	$	47.89		$	41.27		$	47.89
Weighted-average grant date fair value		-		22.30			19.08			22.30
Assumptions:
Expected volatility		-		45.15	%		47.70	%		45.15	%
Expected term (in years)		-		6.0			5.9			6.0
Risk-free interest rate		-		2.64	%		1.43	%		2.64	%
Expected dividend yield		-		-			-			-

Summary of Activity Under Stock Option Plans

A summary of the activity under our stock option plans as of June 30, 2012 and changes during the three and six month periods 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 March 31, 2012		2,440,999		$	37.59		4.9	$	14,667,018
Options granted		-			-
Options exercised		(112,531	)		29.74
Options cancelled		(28,999	)		46.78
Options outstanding at June 30, 2012		2,299,469			38.07		4.8		14,513,131
Options exercisable at June 30, 2012		1,594,269			41.39		3.7		7,279,532
Options vested or expected to vest at June 30, 2012*		2,273,222			38.19		4.7		14,247,752

* 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.

	Options Outstanding			Weighted- Average Exercise Price Per Share
Options outstanding at December 31, 2011		2,401,809		$	37.54
Options granted		46,950			41.27
Options exercised		(116,491	)		29.72
Options cancelled		(32,799	)		44.06
Options outstanding at June 30, 2012		2,299,469

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  June 30, 2012		73,458

Deferred Stock Units

Restricted Stock Activities

	Deferred Stock Units
Non-vested awards outstanding at December 31, 2011		27,350
Awards granted		17,600
Stock issued		(14,800	)
Awards forfeited		-
Non-vested awards outstanding at  June 30, 2012		30,150

Time Based Restricted Stock

Restricted Stock Activities

	Time-Based Restricted Stock Awards
Non-vested awards outstanding at December 31, 2011		86,707
Awards granted		46,180
Stock issued		(980	)
Awards forfeited		(3,782	)
Non-vested awards outstanding at  June 30, 2012		128,125