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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 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):
 
Year ended December 31,
 
2013
 
2012
 
2011
Net income attributable to common stockholders - Basic
$
36,178

 
$
49,791

 
$
26,540

Impact of assumed conversions:
 
 
 
 
 
Interest on convertible notes
—

 
1,959

 
—

Dividends on preferred stock
—

 
—

 
141

Net income attributable to common stockholders - Diluted
$
36,178

 
$
51,750

 
$
26,681

 
 
 
 
 
 
Weighted average common shares outstanding - Basic
51,346

 
48,185

 
44,229

Assumed conversions:
 
 
 
 
 
Incremental common shares from warrants
1,355

 
1,560

 
2,222

Incremental common shares from stock options
1,133

 
992

 
747

Incremental common shares from restricted stock units
7

 
116

 
—

Incremental common shares from convertible preferred stock before conversion
—

 
—

 
440

Incremental common shares from convertible senior notes
—

 
2,701

 
—

Weighted average common shares outstanding - Diluted
53,841

 
53,554

 
47,638

 
 
 
 
 
 
Basic earnings per common share
$
0.70

 
$
1.03

 
$
0.60

Diluted earnings per common share
$
0.67

 
$
0.97

 
$
0.56