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Net Income (Loss) per Share of Common Stock (Tables)
 9 Months Ended
Sep. 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 September 30,
 
Nine months ended September 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
$
16,719

 
$
13,758

 
$
34,225

 
$
(14,794
)
 
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted average shares outstanding
21,796,172

 
21,799,782

 
21,816,323

 
21,667,408

 
 
 
 
 
 
 
 
Denominator for diluted earnings per share:
 
 
 
 
 
 
 
Effect of stock options and restricted stock units
402,536

 
440,531

 
452,161

 
—

Adjusted weighted average shares and assumed conversions
22,198,708

 
22,240,313

 
22,268,484

 
21,667,408

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
0.77

 
$
0.63

 
$
1.57

 
$
(0.68
)
 
 
 
 
 
 
 
 
Diluted earnings (loss) per share
$
0.75

 
$
0.62

 
$
1.54

 
$
(0.68
)
 
 
 
 
 
 
 
 
Shares excluded from diluted earnings (loss) per share due to:
 
 
 
 
 
 
 
Net loss position (excluded from denominator)
—

 
—

 
—

 
458,658

Inclusion would have been anti-dilutive (excluded from calculation)
127,258

 
192,090

 
97,951

 
151,732