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Net Income (Loss) per Share of Common Stock (Tables)
 6 Months Ended
Jun. 30, 2013
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)
2013
 
2012
 
2013
 
2012
Numerators for earnings per share:
 
 
 
 
 
 
 
Net income (loss) that is available to common shareholders
$
12,436

 
$
(10,143
)
 
$
14,425

 
$
(9,502
)
 
 
 
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
 
 
Weighted average shares outstanding
21,288,897

 
20,837,843

 
21,202,411

 
20,803,629

 
 
 
 
 
 
 
 
Denominator for diluted earnings per share:
 
 
 
 
 
 
 
Effect of stock options and restricted stock units (1)
654,388

 
—

 
504,622

 
—

Adjusted weighted average shares and assumed conversions
21,943,285

 
20,837,843

 
21,707,033

 
20,803,629

 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
0.58

 
$
(0.49
)
 
$
0.68

 
$
(0.46
)
 
 
 
 
 
 
 
 
Diluted earnings (loss) per share
$
0.57

 
$
(0.49
)
 
$
0.66

 
$
(0.46
)

(1) The effect of employee stock options and restricted stock units, 437,680 and 424,483 shares for the three months and six months ended June 30, 2012, respectively, were anti-dilutive and thus not included in the earnings per share calculation. This amount would have been dilutive if not for the net loss.