Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2017

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,
	2017			2016			2015
	(in thousands)
Net income	$	84,402		$	65,991		$	39,390
Less distributed and undistributed earnings allocated to participating securities	(1,517		)	(1,496		)	(981		)
Net income allocated to common shares	$	82,885		$	64,495		$	38,409
Weighted average common shares outstanding	41,067			41,668			48,616
Incremental shares from assumed conversions of common stock options and LTIP awards	204			94			14
Adjusted weighted average common shares outstanding	41,271			41,762			48,630
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect	—			—			—