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Net Income (Loss) per Share of Common Stock (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 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
$
(78,815
)
 
$
2,909

 
$
(86,217
)
 
$
12,322

 
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted average shares outstanding
22,075,318

 
21,894,017

 
22,015,008

 
21,869,922

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

 
177,176

 
—

 
156,304

Adjusted weighted average shares and assumed conversions
22,075,318

 
22,071,193

 
22,015,008

 
22,026,226

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
(3.57
)
 
$
0.13

 
$
(3.92
)
 
$
0.56

 
 
 
 
 
 
 
 
Diluted earnings (loss) per share
$
(3.57
)
 
$
0.13

 
$
(3.92
)
 
$
0.56

 
 
 
 
 
 
 
 
Shares excluded from diluted earnings (loss) per share due to:
 
 
 
 
 
 
 
Net loss position (excluded from denominator)
63,488

 
—

 
92,051

 
—

Inclusion would have been anti-dilutive (excluded from calculation)
893,198

 
605,032

 
780,062

 
619,058