Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Share Based Compensation and Related Benefits

In 2011, 2010 and 2009, we recorded share-based compensation and related benefits as follows:

	Year ended December 31,
(Dollars in thousands)	2011			2010			2009
Share-based compensation expense	$	18,221		$	13,761		$	14,784
Income tax benefit related to share-based compensation expense		(4,833	)		(3,400	)		(3,289	)
Capitalized compensation costs		1,466			996			895

Unrecognized Share Based Compensation Expense

As of December 31, 2011 unrecognized share-based compensation expense was as follows:

(Dollars in thousands)	Unrecognized Expense		Average Expected Recognition Period- in Years
Stock options	$	13,102		2.67
Restricted stock units		17,170		2.74
Total unrecognized share-based compensation expense	$	30,272

Weighted Average Assumptions and Fair Values Used for Employee Stock Options and Restricted Stock Units

The following weighted average assumptions and fair values were used for our employee stock options and restricted stock units:

	2011			2010			2009
Equity incentive plan awards
Weighted average expected term of options in years		4.6			4.5			4.5
Weighted average expected volatility of the Company’s underlying common stock		48.7	%		45.1	%		58.8	%
Risk-free interest rate		2.00			2.23			2.00
Expected dividend yield		—			—			—
Weighted average grant date fair value-stock options	$	25.12		$	19.15		$	10.83
Weighted average grant date fair value-restricted stock units		59.69			46.96			24.61

Weighted Average Assumptions and Fair Values Used for ESPP

The following weighted average assumptions and fair values were used for our ESPP:

	2011			2010			2009
ESPP
Expected term in years		0.5			0.5			0.5
Weighted average expected volatility of the Company’s underlying common stock		27.3	%		36.7	%		90.0	%
Risk-free interest rate		0.15			0.22			0.30
Expected dividend yield		—			—			—
Weighted average fair value	$	13.02		$	10.22		$	10.53

Stock Option Information Related to Equity Incentive Plan

The table below provides stock option information related to the 1997 Equity Incentive Plan and the 2006 Incentive Plan for the year ended December 31, 2011:

	Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life in Years		Aggregate Intrinsic Value of In- The-Money Options
Outstanding at December 31, 2010		3,112,253		$	37.88
Granted		385,645			59.17
Exercised		(985,143	)		33.96
Forfeited		(68,444	)		44.31
Expired		(4,951	)		38.31
Outstanding at December 31, 2011		2,439,360			42.64		3.51	$	18,838,493
Vested and expected to vest at December 31, 2011		2,332,192			42.31		3.41		18,412,929
Exercisable at December 31, 2011		1,404,132			40.09		2.17		12,326,931

Stock Options Outstanding

The following table summarizes information regarding stock options outstanding as of December 31, 2011:

	Outstanding Options						Exercisable Options
Range of Exercise Prices	Shares		Weighted Average Remaining Contractual Life in Years		Weighted Average Exercise Price		Shares		Weighted Average Exercise Price
$15.15-19.67		393,436		3.36	$	18.91		225,606	$	18.49
19.68-32.15		311,340		1.83		27.72		250,499		27.79
32.16-45.23		267,747		3.62		43.44		142,986		43.44
45.24-48.26		255,025		1.91		47.29		234,579		47.31
48.27-48.85		292,112		3.24		48.75		215,232		48.74
48.86-49.41		270,807		5.31		49.18		63,561		49.17
49.42-53.07		170,434		2.23		51.33		154,266		51.46
53.08-60.14		154,426		2.56		54.32		117,403		53.66
$60.15-60.65		324,033		6.32		60.37		—		—
		2,439,360		3.51		42.64		1,404,132		40.09

Information for Restricted Stock Units under Equity Incentive Plan

The table below provides information for restricted stock units under the 2006 Incentive Plan for the year ended December 31, 2011:

	Shares			Weighted Average Grant Date Fair Value
Nonvested at December 31, 2010		395,950		$	43.49
Granted		325,447			59.69
Vested		(167,414	)		43.24
Forfeited		(54,864	)		56.36
Nonvested at December 31, 2011		499,119			52.72

Summary of Information Regarding Stock Option and Restricted Stock Activity

The following table summarizes information regarding stock option and restricted stock activity during 2011, 2010 and 2009:

	Year ended December 31,
(Dollars in thousands)	2011		2010		2009
Total intrinsic value of stock options exercised	$	20,772	$	11,871	$	1,399
Total fair value of stock options vested		14,771		12,086		15,214
Total intrinsic value of restricted stock vested		9,142		6,313		5,160
Total fair value of restricted stock vested		7,240		5,522		8,721