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Net Income per Common Share (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017.
 
Three Months Ended    June 30,
 
Six Months Ended    June 30,
(in thousands, except per share data)
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income (loss)
$
(182,777
)
 
$
20,141

 
$
(174,626
)
 
$
38,926

Less: income allocated to unvested restricted shares

 
(229
)
 

 
(469
)
Net income (loss) attributable to common shareholders - basic
(182,777
)
 
19,912

 
(174,626
)
 
38,457

Add: undistributed income attributable to unvested restricted shares - basic

 
27

 

 
51

Less: undistributed income attributable to unvested restricted shares - diluted

 
(27
)
 

 
(51
)
Net income (loss) attributable to common shareholders - diluted
$
(182,777
)
 
$
19,912

 
$
(174,626
)
 
$
38,457

Denominator:
 
 
 
 
 
 
 
Weighted average shares outstanding - basic and diluted
59,750

 
59,863

 
60,022

 
60,020

Net income (loss) per share attributable to common shareholders: basic and diluted
$
(3.07
)
 
$
0.33

 
$
(2.92
)
 
$
0.64