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Per Share Data (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Schedule of earnings per share reconciliation
The following is a reconciliation of the basic and diluted net loss (earnings) per share computation: 

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
Net (loss) income for basic earnings per share
$
(4,346,557
)
 
$
23,841,926

 
$
(8,399,450
)
 
$
19,140,652

Change in fair value of warrants

 
2,039,851

 

 
3,802,809

Net (loss) income, adjusted for change in fair value of warrants for diluted earnings per share
$
(4,346,557
)
 
$
21,802,075

 
$
(8,399,450
)
 
$
15,337,843

Weighted-average shares
51,638,352

 
50,879,599

 
51,638,061

 
50,422,014

Effect of potential common shares

 
3,791,804

 

 
4,085,824

Weighted-average shares: diluted
51,638,352

 
54,671,403

 
51,638,061

 
54,507,838

(Loss) earning per share: basic
$
(0.08
)
 
$
0.47

 
$
(0.16
)
 
$
0.38

(Loss) earning per share: diluted
$
(0.08
)
 
$
0.40

 
$
(0.16
)
 
$
0.28

Schedule of antidilutive securities excluded from computation of earnings per share
The Company incurred losses for the three and six months ended June 30, 2012, whereas for the three and six months ended June 30, 2011, the Company had net income. For all periods presented, certain equity instruments are excluded from the calculation of diluted loss per share as the effect of such shares is anti-dilutive, as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2012
 
2011
 
2012
 
2011
Stock Options:
 
 
 
 
 
 
 
Weighted average number
2,830,810

 
265,889

 
2,815,345

 
221,124

Weighted average exercise price
$
4.36

 
$
12.89

 
$
4.37

 
$
11.89

 
 
 
 
 
 
 
 
Stock-Settled Stock Appreciation Rights:
 
 
 
 
 
 
 
Weighted average number
461,462

 

 
377,913

 

Weighted average exercise price
$
3.53

 

 
$
3.53

 

 
 
 
 
 
 
 
 
Restricted Stock Units:
 
 
 
 
 
 
 
Weighted average number
372,637

 

 
240,824

 

 
 
 
 
 
 
 
 
Warrants:
 
 
 
 
 
 
 
Weighted average number
2,253,902

 

 
2,273,281

 

Weighted average exercise price
$
3.30

 

 
$
3.29