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Net Income per Share of Common Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Computation of Basic and Diluted Earnings Per Share
The following table sets forth the computation of basic and diluted earnings (loss) per share:
Year ended December 31,
(dollars in thousands, except earnings per share)
 
2017
 
2016
 
2015
Numerator for earnings per share:
 
 
 
 
 
 
Net income (loss) that is available to common shareholders
 
$
(93,368
)
 
$
10,073

 
$
66,333

 
 
 

 
 

 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
Weighted average shares outstanding
 
22,030,672

 
21,879,613

 
21,816,935

 
 
 
 
 
 
 
Denominator for diluted earnings per share:
 
 
 
 
 
 
Effect of stock options and restricted stock units
 
—

 
169,330

 
342,214

Adjusted weighted average shares and assumed conversions
 
22,030,672

 
22,048,943

 
22,159,149

 
 
 
 
 
 
 
Basic earnings (loss) per share
 
$
(4.24
)
 
$
0.46

 
$
3.04

 
 
 
 
 
 
 
Diluted earnings (loss) per share
 
$
(4.24
)
 
$
0.46

 
$
2.99

 
 
 
 
 
 
 
Shares excluded from diluted earnings per share due to:
 
 
 
 
 
 
Net loss position (excluded from denominator)
 
85,588

 
—

 
—

Inclusion would have been anti-dilutive (excluded from calculation)
 
846,747

 
602,402

 
105,201