Stock Based Compensation and Stock Options (Tables)

9 Months Ended

Sep. 30, 2012

Stock Options and Stock-Based Compensation [Abstract]

Fair value of options granted

	Three Months Ended September 30,
	2011			2012
Risk-free interest rate		1.13	%		0.61	%
Expected volatility		47	%		47	%
Expected dividend yield		0.00	%		0.00	%
Expected forfeiture rate		9.36	%		11.86	%
Expected weighted average life of option in years		4.7 years			4.5 years

Stock compensation expense for time based options and performance based options

	Three Months Ended
	September 30, 2011			September 30, 2012
Cost of revenues	$	125,000		$	115,000
General and administrative		546,000			(26,000	)
Total cost of stock-based compensation included in income before income tax provision		671,000			89,000
Amount of income tax benefit recognized		(262,000	)		(35,000	)
Amount charged against net income	$	409,000		$	54,000
Effect on diluted net income per share	$	(0.04	)	$	—
	Six Months Ended
	September 30, 2011			September 30, 2012
Cost of revenues	$	250,000		$	228,000
General and administrative		1,079,000			159,000
Total cost of stock-based compensation included in income before income tax provision		1,329,000			387,000
Amount of income tax benefit recognized		(520,000	)		(150,000	)
Amount charged against income	$	809,000		$	237,000
Effect on diluted income per share	$	(0.07	)	$	(0.02	)

Stock options

	Three Months Ended September 30, 2011					Three Months Ended September 30, 2012
	Shares			Average Price		Shares			Average Price
Options outstanding, beginning		797,377		$	29.87		651,903		$	34.59
Options granted		29,550			43.73		20,550			44.14
Options exercised		(26,429	)		23.51		(36,106	)		24.55
Options cancelled		(1,625	)		25.31		(4,082	)		45.05
Options outstanding, ending		798,873		$	30.62		632,265		$	35.41
	Six Months Ended September 30, 2011					Six Months Ended September 30, 2012
	Shares			Average Price		Shares			Average Price
Options outstanding, beginning		813,622		$	29.26		751,323		$	34.19
Options granted		45,225			45.75		31,700			43.06
Options exercised		(54,973	)		23.17		(101,679	)		25.13
Options cancelled		(5,001	)		28.20		(49,079	)		43.08
Options outstanding, ending		798,873		$	30.62		632,265		$	35.41

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 $ 25.42		159,872		2.39	$	20.60		138,553	$	20.32
$ 25.43 to $ 35.20		156,145		2.36	$	29.55		110,754	$	29.47
$ 35.21 to $ 46.00		133,177		5.09	$	40.97		45,955	$	39.58
$ 46.01 to $ 52.76		183,071		3.30	$	49.28		22,341	$	46.85
Total		632,265		3.22	$	35.40		317,603	$	28.16

Outstanding options

	Number of Options			Weighted Average Exercise Per Share		Weighted Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value as of September 30, 2012
Options outstanding at July 1, 2012		651,903		$	34.59
Granted		20,550			44.14
Exercised		(36,106	)		24.55
Cancelled – forfeited		(904	)		44.40
Cancelled – expired		(3,178	)		44.86
Ending outstanding		632,265		$	35.40		3.22	$	6,744,814
Ending vested and expected to vest		568,347		$	34.09		3.14	$	6,638,441
Ending exercisable at September 30, 2012		317,603		$	28.16		2.71	$	5,318,951