Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share (Details)

v3.19.2
Net Income (Loss) Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total (in shares) 9,915,875 14,446,645 9,940,455 16,992,500
2019 Convertible Senior Notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total (in shares) 0 4,358,629 0 5,178,146
2036 Convertible Senior Notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total (in shares) 8,937,353 10,087,669 8,937,353 11,574,051
Stock appreciation rights        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Total (in shares) 978,522 347 1,003,102 240,303