STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Jun. 30, 2012

Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]

Stock-Based Compensation Expense Included in Statements of Operations [Table Text Block]

The following table summarizes the amount of stock-based compensation included in the Condensed consolidated statements of operations:

	Three Months Ended
	June 30,
(in thousands)	2012			2011
Cost of revenues	$	596		$	546
Research, development and engineering	1,124			947
Selling, general and administrative	2,900			2,686
Stock-based compensation included in operating expenses	4,024			3,633
Total stock-based compensation	4,620			4,179
Income tax benefit	(1,382		)	(1,282		)
Total stock-based compensation, net of tax	$	3,238		$	2,897

Summary of Stock Option Activity [Table Text Block]

The following is a summary of the Company’s stock option activity during the three months ended June 30, 2012:

	Options Outstanding
	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life	Aggregate Intrinsic Value
	(in thousands)				(in years)	(in thousands)
Outstanding at March 31, 2012	3,304		$	26.47
Options granted	200		$	33.27
Options exercised	(63	)	$	20.83
Options forfeited or expired	(97	)	$	34.76
Outstanding at June 30, 2012	3,344		$	26.75	3.7	$	24,187
Vested and expected to vest at June 30, 2012	3,303		$	26.66	3.6	$	24,148
Exercisable at June 30, 2012	2,427		$	24.26	2.8	$	22,900

Summary of Restricted Stock Activity [Table Text Block]

The following is a summary of the Company’s restricted stock activity dring the three months ended June 30, 2012:

	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Non-vested at March 31, 2012	815		$	33.37
Restricted stock granted	441		$	31.10
Restricted stock vested	(110	)	$	33.75
Restricted stock forfeited	(37	)	$	31.79
Non-vested at June 30, 2012	1,109		$	32.48

Valuation Assumptions [Table Text Block]

The fair value of stock options granted during the respective periods is estimated on the date of grant using the following weighted average assumptions:

	Three Months Ended
	June 30,
Employee Stock Options	2012			2011
Expected volatility	41.7		%	44.4		%
Risk-free interest rate	0.6		%	1.4		%
Expected dividends	1.3		%	0.6		%
Expected life (in years)	4.3			4.0
Weighted-average grant date fair value	$	10.30		$	12.58