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Net Income (Loss) per Common Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of basic and diluted net income (loss) per share of common stock
The table below presents basic and diluted net income (loss) per share of common stock using the two-class method for the years ended December 31, 2017, December 31, 2016 and December 31, 2015 (dollars, other than shares and per share amounts, in thousands):

 
For the year ended December 31, 2017
 
For the year ended December 31, 2016
 
For the year ended December 31, 2015
Numerator:
 

 
 

 
 

Net income (loss) attributable to common stockholders and participating securities for basic and diluted earnings per share
$
85,097

 
$
(25,015
)
 
$
(9,484
)
Less:
 

 
 

 
 

Dividends and undistributed earnings allocated to participating securities
312

 
377

 
1,045

Net income (loss) allocable to common stockholders—basic and diluted
$
84,785

 
$
(25,392
)
 
$
(10,529
)
Denominator:
 

 
 

 
 

Weighted average common shares outstanding for basic earnings per share
41,817,455

 
41,688,950

 
41,490,556

Weighted average common shares outstanding for diluted earnings per share
41,817,455

 
41,688,950

 
41,490,556

Basic earnings per common share
$
2.03

 
$
(0.61
)
 
$
(0.25
)
Diluted earnings per common share
$
2.03

 
$
(0.61
)
 
$
(0.25
)