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Net Income (Loss) per Share of Common Stock (Tables)
 6 Months Ended
Jun. 30, 2015
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)
2015
 
2014
 
2015
 
2014
Numerators for earnings per share:
 
 
 
 
 
 
 
Net income (loss) that is available to common shareholders
$
14,394

 
$
(25,168
)
 
$
17,506

 
$
(28,552
)
 
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted average shares outstanding
21,775,280

 
21,672,844

 
21,826,566

 
21,600,125

 
 
 
 
 
 
 
 
Denominator for diluted earnings per share:
 
 
 
 
 
 
 
Effect of stock options and restricted stock units
458,746

 
—

 
478,309

 
—

Adjusted weighted average shares and assumed conversions
22,234,026

 
21,672,844

 
22,304,875

 
21,600,125

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
0.66

 
$
(1.16
)
 
$
0.80

 
$
(1.32
)
 
 
 
 
 
 
 
 
Diluted earnings (loss) per share
$
0.65

 
$
(1.16
)
 
$
0.78

 
$
(1.32
)
 
 
 
 
 
 
 
 
Shares excluded from diluted earnings (loss) per share due to:
 
 
 
 
 
 
 
Net loss position (excluded from denominator)
—

 
490,706

 
—

 
465,577

Inclusion would have been anti-dilutive (excluded from calculation)
87,164

 
182,850

 
84,046

 
130,165