Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Expense Related to Share-Based Payments

The table below summarizes the expense related to share-based payments for the years ended December 31 (in thousands):

	2012		2011		2010
Stock options	$	10,341	$	9,654	$	3,775
Restricted stock		8,934		12,089		22,980
Stock-based compensation	$	19,275	$	21,743	$	26,755

Summary of Total Unrecognized Compensation Cost Related to Stock-Based Compensation

The following table summarizes the Company’s total unrecognized compensation cost related to stock-based compensation as of December 31, 2012:

	Unrecognized Compensation Cost		Weighted Average Period of Expense Recognition (in Years)
Stock options	$	28,429		2.46
Restricted stock		5,218		1.19
Total	$	33,647

Summary of Changes in Number of Shares of Common Stock Under Option

 

The following summarizes the changes in the number of shares of common stock under option for the following periods (shares and aggregate intrinsic value in thousands):

	Shares			Weighted Average Exercise Price		Options Exercisable at End of Year		Weighted Average Exercise Price of Exercisable Options		Weighted Average Fair Value of Options Granted During the Year		Aggregate Intrinsic Value
Outstanding at December 31, 2009		8,062		$	7.45		5,523	$	5.15			$	70,958
Granted		3,724			22.56					$	9.19
Exercised		(143	)		5.04								3,697
Forfeited		(729	)		11.95
Tendered		(685	)		5.63
Outstanding at December 31, 2010		10,229			12.79		5,168		6.06				128,472
Granted		526			30.56						9.72
Exercised		(2,008	)		4.51								50,921
Forfeited		(406	)		20.96
Outstanding at December 31, 2011		8,341			15.51		4,394		10.13				119,802
Granted		1,223			36.94						10.82
Exercised		(2,925	)		9.38								129,488
Forfeited		(74	)		20.43
Outstanding at December 31, 2012		6,565			22.17		2,666		14.71				206,636
Vested and expected to vest at December 31, 2012		6,565		$	22.17

Schedule of Changes in the Number of Shares of Restricted Stock and Restricted Stock Units

The following table summarizes the changes in the number of shares of restricted stock and restricted stock units for the following periods (shares in thousands):

	Shares			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2009		4,015		$	4.41
Granted		1,475			22.68
Cancelled		(263	)		15.24
Sold/issued		(3,977	)		4.40
Outstanding at December 31, 2010		1,250			21.93
Granted		261			31.08
Cancelled		(50	)		21.00
Sold/issued		(621	)		23.12
Outstanding at December 31, 2011		840			23.15
Granted		131			41.69
Cancelled		(25	)		33.49
Sold/issued		(474	)		22.05
Outstanding at December 31, 2012		472		$	28.98

Restricted Stock [Member]

Schedule of Weighted-Average Assumptions

The fair value of restricted stock shares based on market conditions was estimated using the Monte Carlo option pricing model with the following assumptions during 2011.

	2011
Risk-free interest rate		1.25	%
Dividend yield		—
Expected volatility		37.00	%
Expected life (in years)		0.63

Stock Option [Member]

Schedule of Stock Options Exercise Price

The following table summarizes information about stock options outstanding at December 31, 2012 (shares in thousands):

Exercise Price	Options Outstanding		Weighted Average Remaining Vesting Life in Years		Options Exercisable
$1.20 – 2.308		11		—		11
5.20		547		—		547
10.00 – 10.07		922		0.15		784
12.00 – 14.00		288		—		288
18.00		84		0.96		56
20.00		360		2.24		112
23.00		2,669		2.35		697
27.37 – 27.83		92		2.82		21
29.11 – 29.90		208		2.10		103
33.49 – 35.78		1,054		3.36		47
39.90 – 40.65		265		3.34		—
47.63		65		3.84		—
		6,565				2,666

Schedule of Weighted-Average Assumptions

The fair value of stock option awards granted was estimated using the Black-Scholes option pricing model with the following weighted-average assumptions for the years ended December 31 as follows:

	2012			2011			2010
Risk-free interest rate		0.59	%		1.47	%		1.93	%
Dividend yield		—			—			—
Expected volatility		36.49	%		37.83	%		44.53	%
Expected life (in years)		4.00			4.03			4.19