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Net Income (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Potentially Dilutive Weighted Average Securities Excluded From the Calculation of Diluted Net Income (Loss) Per Share Attributable to Common Stockholders
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:
   
Three Months 
 Ended 
 September 30, 
 2019
 
Three Months 
 Ended 
 September 30, 
 2018
 
Nine Months 
 Ended 
 September 30, 
 2019
 
Nine Months 
 Ended 
 September 30, 
 2018
Stock appreciation rights
952,170

 
—

 
985,745

 
—

2019 Convertible Senior Notes
—

 
3,045,781

 
—

 
4,225,737

2036 Convertible Senior Notes
8,937,353

 
7,282,194

 
8,937,353

 
9,841,639

Total
9,889,523

 
10,327,975

 
9,923,098

 
14,067,376
Calculation of Diluted Net Income (Loss) Per Share
The following table presents the calculation of diluted net income (loss) per share attributable to common stockholders:
   
Three Months 
 Ended 
 September 30, 
 2019
 
Three Months 
 Ended 
 September 30, 
 2018
 
Nine Months 
 Ended 
 September 30, 
 2019
 
Nine Months 
 Ended 
 September 30, 
 2018
Net income (loss) from continuing operations attributable to the Company’s common stockholders - Basic
$
(13,753
)
 
$
24,799

 
$
(112,775
)
 
$
265,381

Plus (less): effect of participating securities
—

 
673

 
—

 
6,976

Net income (loss) attributable to common stockholders
(13,753
)
 
25,472

 
(112,775
)
 
272,357

Less: effect of participating securities
—

 
(673
)
 
—

 
(6,976
)
Net income (loss) from continuing operations attributable to the Company's common stockholders - Diluted
$
(13,753
)
 
$
24,799

 
$
(112,775
)
 
$
265,381

 
 
 
 
 
 
 
 
Net income (loss) from discontinued operations attributable to the Company’s common stockholders - Basic
$
(2,193
)
 
$
(469
)
 
$
(8,672
)
 
$
862

Plus (less): effect of participating securities
—

 
—

 
—

 
23

Net income (loss) attributable to common stockholders
(2,193
)
 
(469
)
 
(8,672
)
 
885

Less: effect of participating securities
—

 
—

 
—

 
(23
)
Net income (loss) from discontinued operations attributable to the Company's common stockholders - Diluted
$
(2,193
)
 
$
(469
)
 
$
(8,672
)
 
$
862

 
 
 
 
 
 
 
 
Net income (loss) attributable to the Company's common stockholders - Basic
$
(15,946
)
 
$
24,343

 
$
(121,447
)
 
$
266,243

Plus (less): effect of participating securities
—

 
660

 
—

 
6,999

Net income (loss) attributable to common stockholders
(15,946
)
 
25,003

 
(121,447
)
 
273,242

Less: effect of participating securities
—

 
(660
)
 
—

 
(6,999
)
Net income (loss) attributable to the Company's common stockholders - Diluted
$
(15,946
)
 
$
24,343

 
$
(121,447
)
 
$
266,243

 
 
 
 
 
 
 
 
Shares:

 
 
 

 

Weighted-average shares used to compute basic net income (loss) per share
38,959,606

 
37,270,928

 
38,060,782

 
37,815,598

Adjustment to reflect conversion of convertible notes
—

 
7,648,408

 
—

 
4,673,989

Adjustment to reflect stock appreciation right conversions
—

 
584,035

 
—

 
420,941

Weighted-average shares used to compute diluted net income (loss) per share
38,959,606

 
45,503,371

 
38,060,782

 
42,910,528

 
 
 
 
 
 
 
 
Net income (loss) per share attributable to common stockholders - Diluted

 
 
 

 

Continuing operations
$
(0.35
)
 
$
0.55

 
$
(2.96
)
 
$
6.18

Discontinued operations
$
(0.06
)
 
$
(0.01
)
 
$
(0.23
)
 
$
0.02

Diluted net income (loss)
$
(0.41
)
 
$
0.53

 
$
(3.19
)
 
$
6.20