

11.	Net Income Per Share

We utilize the two-class method to compute net income per share. The two-class method allocates a portion of net income to participating securities, which includes unvested awards of share-based payments with non-forfeitable rights to receive dividends. Net income allocated to unvested share-based payments is excluded from net income allocated to common shares. Any undistributed losses resulting from dividends exceeding net income are not allocated to participating securities. Basic net income per share is computed by dividing net income allocated to common shares by the weighted average number of common shares outstanding during the period. Diluted net income per share is computed by dividing net income allocated to common shares by the weighted average number of common shares outstanding during the period, plus the dilutive effect of outstanding stock options.

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	—			—			—