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Net Income per Share (Tables)
 6 Months Ended
Jun. 30, 2019
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 June 30,
 
Six Months Ended 
 June 30,
(in thousands)
2019
2018
 
2019
2018
 
 
 
 
 
 
Net income
$
28,556

$
24,560

 
$
104,845

$
74,551

Less distributed and undistributed earnings allocated to participating securities
(309
)
(346
)
 
(1,183
)
(1,064
)
Net income allocated to common shares
$
28,247

$
24,214

 
$
103,662

$
73,487

 
 
 
 
 
 
Weighted average common shares outstanding
40,771

41,377

 
40,640

41,301

Incremental shares from assumed LTIP awards and conversions of common stock options
145

156

 
140

324

Adjusted weighted average common shares outstanding
40,916

41,533

 
40,780

41,625