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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Components of basic and diluted earnings per common share
Basic and diluted earnings (loss) per common share are as follows (in thousands, except per share data):
 
Year ended December 31,
 
2015
 
2014
 
2013
Net income (loss) attributable to common stockholders
$
(13,462
)
 
$
53,603

 
$
36,178

 
 
 
 
 
 
Weighted average common shares outstanding - Basic
54,459

 
54,511

 
51,346

Assumed conversions:
 
 
 
 
 
Incremental common shares from warrants
—

 
121

 
1,355

Incremental common shares from stock options
—

 
880

 
1,133

Incremental common shares from restricted stock units
—

 
14

 
7

Weighted average common shares outstanding - Diluted
54,459

 
55,526

 
53,841

 
 
 
 
 
 
Basic earnings (loss) per common share
$
(0.25
)
 
$
0.98

 
$
0.70

Diluted earnings (loss) per common share
$
(0.25
)
 
$
0.97

 
$
0.67