Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock-Based Compensation Expense Included In Consolidated Statements Of Operations


(in thousands)	2011			2010			2009
Stock-based compensation expense:
Cost of services	$	2,737		$	1,825		$	1,096
Operating expenses		6,291			4,920			3,577

Total stock-based compensation before tax		9,028			6,745			4,673
Income tax benefit		(2,854	)		(2,185	)		(1,688	)

Weighted-Average Assumptions Used In Black-Scholes Option Valuation Model


	2011			2010			2009
Expected volatility (1)		45	%		41	%		41	%
Expected term in years (2)		5.1			5.1			6.1
Risk-free interest rate (3)		1.18	%		1.65	%		2.52	%
Expected annual dividend yield (4)		0.58	%		0.71	%		0.81	%

(1)	The expected volatility for each grant is determined based on the average of historical weekly price changes of the Company's common stock over a period of time which approximates the expected option term.

(2)	The expected option term for each grant is determined based on the historical exercise behavior of employees and post-vesting employment termination behavior.

(3)	The risk-free interest rate is based on the yield of zero-coupon U.S. Treasury securities for a period that is commensurate with the expected option term at the time of grant.

(4)

The expected annual dividend yield is based on the weighted-average of the dividend yield assumptions used for options granted during the applicable period. The expected annual dividend is based on the expected dividend of $0.12 per share, per year ($0.03 per share, per quarter times 4 quarters) divided by the average stock price.

Summary Of Combined Stock Option Activity


	Shares (in thousands)			Weighted-average exercise price		Weighted- average remaining contractual term (in years)		Aggregate intrinsic value (in thousands)
Options outstanding as of January 1, 2011		3,003		$	12.54
Granted		342			31.10
Exercised		(669	)		9.33
Forfeited/Cancelled		(144	)		15.63

Options outstanding as of December 31, 2011		2,532		$	15.46


Vested and expected to vest as of December 31, 2011		2,279		$	14.48		5.13	$	35,513


Exercisable as of December 31, 2011		1,727		$	10.66		4.06	$	32,829

Summary Of Combined Restricted Stock Units Activity


	Shares (in thousands)			Weighted- Average Grant-Date Fair Value		Aggregate Intrinsic Value (in thousands)
Nonvested at January 1, 2011		570		$	26.45
Granted		365			30.87
Vested		(187	)		25.87
Forfeited		(58	)		28.27

Nonvested at December 31, 2011		690		$	28.82	$	20,383

Expected to vest at December 31, 2011		498		$	29.20	$	14,631