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Net Income (Loss) Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Net Income (Loss) Per Share  
Schedule of calculation of net income (loss) per share

    

Year Ended  December 31,

(in thousands, except per share data)

    

2020

    

2019

    

2018

Basic Net Income (Loss) Per Share

Basic net income (loss)

$

(295,697)

$

446,906

$

109,493

Weighted average common shares outstanding

218,073

214,913

212,383

Basic net income (loss) per share

$

(1.36)

$

2.08

$

0.52

Diluted Net Income (Loss) Per Share

Diluted net income (loss)

$

(295,697)

$

446,906

$

109,493

Weighted average common shares outstanding

218,073

214,913

212,383

Dilutive stock options and awards

2,744

3,252

Weighted average shares used to compute diluted net income (loss) per share

218,073

217,657

215,635

Diluted net income (loss) per share

$

(1.36)

$

2.05

$

0.51

Schedule of antidilutive securities excluded from the computation of earnings per share

The following potential common shares were excluded from the calculation as their effect would be anti-dilutive:

    

2020

    

2019

    

2018

    

Outstanding stock options and awards

 

15,274,871

 

9,349,889

 

8,255,992

 

Common shares issuable upon conversion of the 2020 Notes

 

 

368,939

 

368,939

 

Total potential common shares excluded from diluted net income (loss) per share computation

 

15,274,871

 

9,718,828

 

8,624,931