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Net Income Per Share (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
 
2016
 
2015
 
2014
 
 
(in thousands)
Net income
 
$
65,991

 
$
39,390

 
$
28,004

Less distributed and undistributed earnings allocated to participating securities
 
(1,496
)
 
(981
)
 
(2,002
)
Net income allocated to common shares
 
$
64,495

 
$
38,409

 
$
26,002

 
 
 
 
 
 
 
Weighted average common shares outstanding
 
20,834

 
24,308

 
24,708

Incremental shares from assumed conversions of common stock options and LTIP awards
 
47

 
7

 
4

Adjusted weighted average common shares outstanding
 
20,881

 
24,315

 
24,712

 
 
 
 
 
 
 
Potentially dilutive securities not included in weighted average share
calculation due to anti-dilutive effect
 
—

 
—

 
4