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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Components of basic and diluted earnings per common share
Basic and diluted earnings per common share are as follows (in thousands, except per share data):

Three months ended June 30,
 
Six months ended June 30,

2013
 
2012
 
2013
 
2012
Net income - Basic
$
8,440

 
$
13,178

 
$
16,205

 
$
16,784

Impact of assumed conversions:
 
 
 
 
 
 
 
Interest on convertible notes
—

 
570

 
—

 
—

Net income - Diluted
$
8,440

 
$
13,748

 
$
16,205

 
$
16,784

 
 
 
 
 
 
 
 
Weighted average common shares outstanding - Basic
51,086

 
48,227

 
49,841

 
47,890

Assumed conversions:
 
 
 
 
 
 
 
Incremental common shares from warrants
1,429

 
1,657

 
1,421

 
1,678

Incremental common shares from stock options
1,174

 
983

 
1,167

 
977

Incremental common shares from restricted stock units
24

 
73

 
16

 
41

Incremental common shares from convertible senior notes
—

 
3,092

 
—

 
—

Weighted average common shares outstanding - Diluted
53,713

 
54,032

 
52,445

 
50,586

 
 
 
 
 
 
 
 
Basic earnings per common share
$
0.17

 
$
0.27

 
$
0.33

 
$
0.35

Diluted earnings per common share
$
0.16

 
$
0.25

 
$
0.31

 
$
0.33