Stock Options and Stock-Based Compensation (Tables)

3 Months Ended

Jun. 30, 2012

Stock Options and Stock-Based Compensation [Abstract]

Fair value of options granted

	Three Months Ended June 30,
	2011			2012
Risk-free interest rate		1.88	%		0.62	%
Expected volatility		46	%		47	%
Expected dividend yield		0.00	%		0.00	%
Expected forfeiture rate		9.30	%		11.70	%
Expected weighted average life of option in years		4.7 years			4.6 years

Stock compensation expense for time based options and performance based options

	Three Months Ended
	June 30, 2011			June 30, 2012
Cost of revenues	$	126,000		$	113,000
General and administrative		532,000			185,000
Total cost of stock-based compensation included in income before income tax provision		658,000			298,000
Amount of income tax benefit recognized		(256,000	)		(119,000	)
Amount charged against net income	$	402,000		$	179,000
Effect on diluted net income per share	$	(0.03	)	$	(0.02	)

Stock options

	Three Months Ended June 30, 2011					Three Months Ended June 30, 2012
	Shares			Average Price		Shares			Average Price
Options outstanding, beginning		813,662		$	29.26		751,023		$	34.19
Options granted		15,675			49.56		11,150			41.08
Options exercised		(28,544	)		22.85		(65,573	)		25.45
Options cancelled		(3,416	)		29.47		(44,697	)		42.93
Options outstanding, ending		797,377		$	29.89		651,903		$	34.59

Stock options outstanding and exercisable

Range of Exercise Price	Number of Outstanding Options		Weighted Average Remaining Contractual Life		Outstanding Options – Weighted Average Exercise Price		Exercisable Options – Number of Exercisable Options		Exercisable Options – Weighted Average Exercise Price
$15.55 to $25.10		148,367		2.09	$	19.66		133,993	$	19.57
$25.11 to $30.97		181,964		2.93	$	28.24		120,136	$	28.19
$30.98 to $46.00		135,181		4.32	$	39.33		47,584	$	36.77
$46.01 to $52.76		186,391		3.84	$	49.23		24,084	$	46.68
Total		651,903		3.29	$	34.59		325,797	$	27.27

Outstanding options

	Number of Options			Weighted Average Exercise Per Share		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value as of June 30, 2012
Options outstanding at March 31, 2012		751,023			34.19
Granted		11,150			41.08
Exercised		(65,573	)		25.45
Cancelled – forfeited		(44,395	)		43.04
Cancelled – expired		(302	)		27.15
Ending outstanding		651,903			34.59		3.29		9,689,000
Ending vested and expected to vest		586,470			33.21		3.19		9,444,000
Ending exercisable at June 30, 2012		325,797			27.27		2.58		7,083,000