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Net Income per Common Share (Tables)
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Summary of Calculation of Net Income Per Common Share
The following summarizes the calculation of net income per common share attributable to common shareholders for the three and nine months ended September 30, 2018 and 2017.
 
Three Months Ended    September 30,
 
Nine Months Ended    September 30,
(in thousands, except per share data)
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
(565
)
 
$
10,871

 
$
(175,191
)
 
$
49,796

Less: income allocated to unvested restricted shares
—

 
(279
)
 
—

 
(738
)
Net income (loss) attributable to common shareholders - basic
(565
)
 
10,592

 
(175,191
)
 
49,058

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

 
—

 
—

 
16

Less: undistributed income attributable to unvested restricted shares - diluted
—

 
—

 
—

 
(16
)
Net income (loss) attributable to common shareholders - diluted
$
(565
)
 
$
10,592

 
$
(175,191
)
 
$
49,058

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding - basic and diluted
59,766

 
59,849

 
59,996

 
60,010

Net income (loss) per share attributable to common shareholders: basic and diluted
$
(0.01
)
 
$
0.18

 
$
(2.92
)
 
$
0.82