Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-based Compensation Expense Recognized by Company

Stock-based compensation expense recognized by the Company was as follows (in thousands):

	Three Months Ended March 31,
	2013		2012
Stock options	$	2,410	$	1,389
Restricted stock units		5,442		1,802
Performance stock units		692		—
Total recognized stock-based compensation expense	$	8,544	$	3,191

Summary of Information Related to Stock Options

The following table presents summary information related to stock options:

	Number of Options Outstanding			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)		Aggregate Intrinsic Value
Balance, December 31, 2012		1,474,346		$	23.50
Granted		80,930
Exercised		(50,833	)
Forfeited		(31,758	)
Balance, March 31, 2013		1,472,685		$	24.69		7.88	$	12,476,513
Vested at March 31, 2013		583,150		$	11.81		6.34	$	10,133,063
Exercisable at March 31, 2013		589,797		$	11.71		6.34	$	8,707,609

Summary of Activity for RSUs (Excluding RSUs that are Subject to Performance-Based Vesting Conditions)

The following table presents a summary of activity for RSUs (excluding RSUs that are subject to performance-based vesting conditions (“Performance Stock Awards” or PSUs”)):

	Number of RSUs			Weighted Average Grant Date Fair Value
Balance, December 31, 2012		638,299		$	34.22
Granted		1,386,295			32.52
Vested		(95,978	)		31.76
Forfeited		(20,325	)		34.32
Balance, March 31, 2013		1,908,291		$	33.11

Summary of Activity for PSUs

The following table presents a summary of activity for PSUs:

	Number of PSUs		Weighted Average Grant Date Fair Value
Balance, December 31, 2012		10,000	$	39.86
Granted		382,500		28.72
Vested		—		—
Forfeited		—		—
Balance, March 31, 2013		392,500	$	29.00