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Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Schedule of Stock-based Compensation Expense

A summary of the Company's stock-based compensation expense for the three months ended March 31, 2012 and 2011 is presented below:

	March 31, 2012		March 31, 2011
PRSU expense	$	2,701	$	877
Option expense		1,128		1,358
RSU/DSU expense		533		494
Total stock-based compensation expense	$	4,362	$	2,729

Unvested Performance-based Units Activity

A summary of the Company's PRSU activity and related information for the three months ended March 31, 2012 is presented below:

	Number of Shares		Weighted-Average Grant Date Fair Value		Aggregate Intrinsic Value
Awards outstanding at December 31, 2011	285	$	37.93
Granted	134		71.52
Vested	-		-
Forfeited	-		-
Awards outstanding at March 31, 2012	419	$	48.67	$	35,359

Schedule of Stock Option Activity

A summary of the Company's stock option activity and related information for the three months ended March 31, 2012 is presented below:

	Number of Shares			Weighted-Average Grant Date Fair Value	Weighted-Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Options outstanding December 31, 2011	3,408		$	11.15
Granted	88			71.17
Forfeited	-			-
Exercised	(494	)		14.82
Options outstanding at March 31, 2012	3,002		$	15.06	6.43	$	208,134
Options exercisable at March 31, 2012	2,019		$	13.75	6.08	$	142,704

Schedule of Unrecognized Compensation Expense

A summary of total unrecognized stock-based compensation expense based on current performance estimates related to the PRSUs and options granted during the three months ended March 31, 2012 is presented below:

		March 31, 2012	Weighted-Average Remaining Vesting Period
Unrecognized PRSU expense	$	9,152	2.86
Unrecognized stock option expense		2,965	2.84
Total unrecognized stock-based compensation expense	$	12,117	2.85

- Definition

Tabular disclosure of an equity-based arrangement (such as stock or unit options and stock or unit awards) with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain equity-based awards at future dates, sometimes including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares or units issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.

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