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Per Share Data (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted
The following is a reconciliation of the basic and diluted loss per share computation: 
 
Three months ended September 30,
 
Nine months ended September 30,
 
2019
 
2018
 
2019
 
2018
Net (loss)/income for basic earnings per share
$
(1,205,827
)
 
$
388,050,413

 
$
(2,738,542
)
 
$
369,416,894

Less: Change in fair value of warrants
981,923

 
(2,328,674
)
 
4,774,711

 
(5,271,503
)
Net (loss)/income, adjusted for change in fair value of warrants for diluted earnings per share
$
(2,187,750
)
 
$
390,379,087

 
$
(7,513,253
)
 
$
374,688,397

Weighted-average shares
81,064,927

 
80,023,044

 
80,988,813

 
79,650,373

Effect of potential common shares
1,116,931

 
2,906,432

 
1,159,520

 
3,093,854

Weighted-average shares: diluted
82,181,858

 
82,929,476

 
82,148,333

 
82,744,227

(Loss)/income per share: basic
$
(0.01
)
 
$
4.85

 
$
(0.03
)
 
$
4.64

(Loss)/income per share: diluted
$
(0.03
)
 
$
4.71

 
$
(0.09
)
 
$
4.53
Schedule of antidilutive securities excluded from computation of earnings per share
The weighted average number of equity instruments excluded consisted of:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2019
 
2019
Stock Options
332,861

 
353,801

Stock-Settled Stock Appreciation Rights
—

 
2,227

Restricted Stock Units
598,793

 
545,422