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Net Income (Loss) per Share of Common Stock (Tables)
 6 Months Ended
Jun. 30, 2019
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 income (loss) per share:
 
 
Three months ended June 30,
 
Six months ended June 30,
(dollars in thousands, except earnings per share)
 
2019
 
2018
 
2019
 
2018
Numerator for earnings per share:
 
 
 
 
 
 
 
 
Net income (loss) that is available to common shareholders
 
$
(43,767
)
 
$
3,988

 
$
(48,309
)
 
$
1,027

 
 
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
 
Weighted average shares outstanding
 
22,400,246

 
22,170,338

 
22,331,786

 
22,130,503

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

 
185,550

 
—

 
36,584

Adjusted weighted average shares and assumed conversions
 
22,400,246

 
22,355,888

 
22,331,786

 
22,167,087

 
 
 
 
 
 
 
 
 
Basic income (loss) per share
 
$
(1.95
)
 
$
0.18

 
$
(2.16
)
 
$
0.05

 
 
 
 
 
 
 
 
 
Diluted income (loss) per share
 
$
(1.95
)
 
$
0.18

 
$
(2.16
)
 
$
0.05

 
 
 
 
 
 
 
 
 
Anti-dilutive shares excluded from computation of diluted income (loss) per share
 
1,939,290

 
752,375

 
1,700,192

 
982,386