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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2014
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,
 
2014
 
2013
 
2012
Net income attributable to common stockholders - Basic
$
53,603

 
$
36,178

 
$
49,791

Impact of assumed conversions:
 
 
 
 
 
Interest on convertible notes
—

 
—

 
1,959

Net income attributable to common stockholders - Diluted
$
53,603

 
$
36,178

 
$
51,750

 
 
 
 
 
 
Weighted average common shares outstanding - Basic
54,511

 
51,346

 
48,185

Assumed conversions:
 
 
 
 
 
Incremental common shares from warrants
121

 
1,355

 
1,560

Incremental common shares from stock options
880

 
1,133

 
992

Incremental common shares from restricted stock units
14

 
7

 
116

Incremental common shares from convertible senior notes
—

 
—

 
2,701

Weighted average common shares outstanding - Diluted
55,526

 
53,841

 
53,554

 
 
 
 
 
 
Basic earnings per common share
$
0.98

 
$
0.70

 
$
1.03

Diluted earnings per common share
$
0.97

 
$
0.67

 
$
0.97