(Loss) Earnings per Share - Securities Excluded from Diluted Earnings per Share Computation (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from earnings per share (in shares)	4,008	8,407	671	8,407
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from earnings per share (in shares)	9,372	2,894	0	2,894
Performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from earnings per share (in shares)	3,054	465	3,054	465
Class B Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities excluded from earnings per share (in shares)	152,117	170,941	152,117	170,941