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Net Income (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Dilutive weighted average securities were excluded from the calculation of diluted net income (loss) per share attributable to common stockholders during the periods
The following potentially dilutive weighted average securities were excluded from the calculation of diluted net income (loss) per share attributable to common stockholders during the periods presented, as the effect was anti-dilutive:
 
Year Ended December 31,
 
2019
 
2018
 
2017
Stock appreciation rights
—

 
—

 
622,633

2019 Convertible Senior Notes
—

 
—

 
5,567,112

2036 Convertible Senior Notes
—

 
—

 
14,106,725

Total
—

 
—

 
20,296,470
Calculation of diluted net income per share
The following table presents the calculation of diluted net income (loss) from continuing operations per share:
 
2019
 
2018
 
2017
Net income (loss) from continuing operations available to common stockholders - Basic
$
381,112

 
$
295,804

 
$
(66,279
)
Plus (less): effect of participating securities
8,619

 
7,824

 
—

Net income (loss) available to common stockholders
389,731

 
303,628

 
(66,279
)
Less: effect of participating securities
(8,619
)
 
(7,824
)
 
—

Net income (loss) from continuing operations available to common stockholders - Diluted
$
381,112

 
$
295,804

 
$
(66,279
)
 
 
 
 
 
 
Net loss from discontinued operations available to common stockholders - Basic
$
(9,667
)
 
$
(11,312
)
 
$
(12,800
)
Plus (less): effect of participating securities
—

 
—

 
—

Net loss available to common stockholders
(9,667
)
 
(11,312
)
 
(12,800
)
Less: effect of participating securities
—

 
—

 
—

Net loss from discontinued operations available to common stockholders - Diluted
$
(9,667
)
 
$
(11,312
)
 
$
(12,800
)
 
 
 
 
 
 
Net income (loss) available to common stockholders - Basic
$
371,659

 
$
284,783

 
$
(79,079
)
Plus (less): effect of participating securities
8,405

 
7,533

 
—

Net income (loss) available to common stockholders
380,064

 
292,316

 
(79,079
)
Less: effect of participating securities
(8,405
)
 
(7,533
)
 
—

Net income (loss) available to common stockholders - Diluted
$
371,659

 
$
284,783

 
$
(79,079
)
 
 
 
 
 
 
Net income (loss) available to common stockholders - Diluted
 
 
 
 
 
Weighted-average shares used to compute basic net income (loss) per share
38,288,610

 
37,687,552

 
38,731,015

Adjustment to reflect conversion of convertible notes
3,589,065

 
5,416,043

 
—

Adjustment to reflect stock appreciation right conversions
443,305

 
550,125

 
—

Weighted-average shares used to compute diluted net income (loss) per share
42,320,980

 
43,653,720

 
38,731,015

Net income (loss) per share available to common stockholders - Diluted
 
 
 
 
 
Continuing operations
$
9.01

 
$
6.78

 
$
(1.71
)
Discontinued operations
$
(0.25
)
 
$
(0.30
)
 
$
(0.33
)
Diluted net income (loss)
$
8.78

 
$
6.52

 
$
(2.04
)