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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Antidilutive Securities Excluded from Computation of Earnings Per Share The following table presents the maximum number of shares and conversion price per share of Class C capital stock for each of the Notes based on the aggregate principal amount outstanding as of June 30, 2021 (in thousands, except per share amounts):
Maturity DateSharesConversion Price per Share
September 1, 202611,464 $43.51 
May 15, 20258,408 67.20 
September 1, 202413,983 43.51 
July 1, 20234,692 78.37 
For the periods presented, the following table reconciles the denominators used in the basic and diluted net income (loss) per share calculations (in thousands):
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2021202020212020
Denominator for basic calculation248,152 219,467 245,763 215,070 
Effect of dilutive securities:
Option awards10,472 — 11,450 — 
Unvested restricted stock units2,872 — 3,271 — 
Denominator for dilutive calculation261,496 219,467 260,484 215,070 
For the periods presented, the following Class A common stock and Class C capital stock equivalents were excluded from the calculations of diluted net income (loss) per share because their effect would have been antidilutive (in thousands):
 Three Months Ended
June 30,		Six Months Ended
June 30,
 2021202020212020
Weighted-average Class A common stock and Class C capital stock option awards outstanding245 25,202 1,389 22,649 
Weighted-average Class C capital stock restricted stock units outstanding984 9,086 645 8,354 
Class A common stock issuable upon conversion of the convertible notes maturing in 2020— 400 — 400 
Class C capital stock issuable upon conversion of the 2021 Notes, 2023 Notes, 2024 Notes, 2025 Notes and 2026 Notes38,641 7,232 38,796 7,316 
Total Class A common stock and Class C capital stock equivalents39,870 41,920 40,830 38,719