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Basic and Diluted Net Income per Common Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Reconciliation [Table Text Block]
The numerators and denominators used in computing basic and diluted net income per common share for the three and six months ended June 30, 2013 and 2012 can be reconciled as follows (dollars in thousands, except per share data):
 
 
Three months ended  
 June 30,
 
Six months ended  
 June 30,
 
2013
 
2012
 
2013
 
2012
Net income
$
46,424

 
$
1,757

 
$
48,120

 
$
2,815

 
 
 
 
 
 
 
 
Weighted-average shares outstanding - basic
47,172,103

 
47,133,361

 
47,156,700

 
47,112,583

Dilutive securities
364,683

 
150,543

 
238,658

 
146,730

Weighted-average shares outstanding - diluted
47,536,786

 
47,283,904

 
47,395,358

 
47,259,313

Common stock equivalent shares excluded due to antidilutive effect
32,399

 
19,412

 
32,399

 
14,719

 
 
 
 
 
 
 
 
Basic and diluted:
 

 
 

 
 

 
 

Net income per common share
$
0.98

 
$
0.04

 
$
1.02

 
$
0.06

Net income per common share (diluted)
$
0.98

 
$
0.04

 
$
1.02

 
$
0.06