Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings 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:

	Year ended December 31,
	2014			2013			2012
	(in thousands)
Net income	$	28,004		$	32,032		$	40,402
Less distributed and undistributed earnings allocated to participating securities	(2,002		)	(916		)	(1,224		)
Net income allocated to common shares	$	26,002		$	31,116		$	39,178
Weighted average common shares outstanding	24,708			24,850			25,007
Incremental shares from assumed conversions of common stock options	4			22			60
Adjusted weighted average common shares outstanding	24,712			24,872			25,067
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect	4			8			29