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Net Income per Share (Tables)
 9 Months Ended
Sep. 30, 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:
 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(in thousands)
 
 
 
 
 
 
 
 
 
Net income
 
$
19,202

 
$
14,065

 
$
68,848

 
$
56,471

Less distributed and undistributed earnings allocated to participating securities
 
(337
)
 
(330
)
 
(1,233
)
 
(1,283
)
Net income allocated to common shares
 
$
18,865

 
$
13,735

 
$
67,615

 
$
55,188

 
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
20,473

 
20,843

 
20,555

 
20,895

Incremental shares from assumed LTIP awards and conversions of common stock options
 
148

 
13

 
119

 
11

Adjusted weighted average common shares outstanding
 
20,621

 
20,856

 
20,674

 
20,906