Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Net Income Per Share [Abstract]

Summary of the net income allocated to common shares and the basic and diluted shares used in the net income per share computations

The following table summarizes the net income allocated to common shares and the basic and diluted shares used in the net income per share computations:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
	(in thousands)
Net income	$	11,452		$	4,099		$	30,957		$	19,626
Less income allocated to participating securities		(334	)		(120	)		(898	)		(582	)
Net income allocated to common shares	$	11,118		$	3,979		$	30,059		$	19,044
Weighted average common shares outstanding		24,923			25,425			25,034			25,546
Incremental shares from assumed conversions of common stock options		57			74			63			98
Adjusted weighted average common shares outstanding		24,980			25,499			25,097			25,644
Potentially dilutive securities not included in weightedaverage share calculation due to anti-dilutive effect		41			54			33			21