Net Income per Share (Tables)

3 Months Ended

Mar. 31, 2013

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 March 31,
	2013			2012
(in thousands)
Net income	$	13,173		$	13,884
Less distributed and undistributed earnings allocated to participating securities		(383	)		(402	)
Net income allocated to common shares	$	12,790		$	13,482
Weighted average common shares outstanding		24,897			25,087
Incremental shares from assumed conversions of common stock options		30			71
Adjusted weighted average common shares outstanding		24,927			25,158
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect		16			16