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Net Income per Share (Tables)
 3 Months Ended
Mar. 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:
 
 
Three Months Ended 
 March 31,
 
 
2017
 
2016
 
(in thousands)
 
 
 
 
 
Net income
 
$
35,628

 
$
32,693

Less distributed and undistributed earnings allocated to participating securities
 
(781
)
 
(664
)
Net income allocated to common shares
 
$
34,847

 
$
32,029

 
 
 
 
 
Weighted average common shares outstanding
 
20,565

 
20,972

Incremental shares from assumed LTIP awards and conversions of common stock options
 
101

 
6

Adjusted weighted average common shares outstanding
 
20,666

 
20,978