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Net Income (Loss) per Share of Common Stock (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted earnings (loss) per share:
 
Three months ended June 30,
 
Six months ended June 30,
(dollars in thousands, except earnings per share)
2017
 
2016
 
2017
 
2016
Numerator for earnings per share:
 
 
 
 
 
 
 
Net income (loss) that is available to common shareholders
$
(832
)
 
$
8,695

 
$
(7,402
)
 
$
9,413

 
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted average shares outstanding
22,029,519

 
21,865,315

 
21,984,365

 
21,857,743

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

 
138,071

 
—

 
143,860

Adjusted weighted average shares and assumed conversions
22,029,519

 
22,003,386

 
21,984,365

 
22,001,603

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
(0.04
)
 
$
0.40

 
$
(0.34
)
 
$
0.43

 
 
 
 
 
 
 
 
Diluted earnings (loss) per share
$
(0.04
)
 
$
0.40

 
$
(0.34
)
 
$
0.43

 
 
 
 
 
 
 
 
Shares excluded from diluted earnings (loss) per share due to:
 
 
 
 
 
 
 
Net loss position (excluded from denominator)
60,141

 
—

 
111,791

 
—

Inclusion would have been anti-dilutive (excluded from calculation)
924,652

 
641,964

 
744,317

 
628,134