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Net Income per Common Share
12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Net Income per Common Share
Net Income per Common Share
The following table summarizes the calculation of net income per share attributable to common shareholders for the years ended December 31, 2017, 2016 and 2015:
Year ended December 31,
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income
$
72,793

 
$
108,787

 
$
103,409

Less: income allocated to unvested restricted shares
(1,060
)
 
(1,147
)
 
(925
)
Net income attributable to common shareholders—basic
71,733

 
107,640

 
102,484

Add: undistributed income attributable to unvested restricted shares—basic
58

 
297

 
235

Less: undistributed income attributable to unvested restricted shares—diluted
(58
)
 
(297
)
 
(235
)
Net income attributable to common shareholders—diluted
$
71,733

 
$
107,640

 
$
102,484

Denominator:
 
 
 
 
 
Weighted average shares outstanding—basic
60,001

 
61,093

 
62,116

Dilutive shares—stock options

 

 
1

Weighted average shares outstanding—diluted
60,001

 
61,093

 
62,117

Net income attributable to common shareholders:
 
 
 
 
 
Basic and diluted
$
1.20

 
$
1.76

 
$
1.65