Earnings Per Share - Summary of Shares Excluded From Diluted Earnings Per Share Calculation (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Out-of-the-money stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-diluted shares excluded from computation of earnings per share (in shares) 4,696 4,667 4,756 4,612
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-diluted shares excluded from computation of earnings per share (in shares) 8,000 8,000 8,000 8,000
Restricted stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-diluted shares excluded from computation of earnings per share (in shares) 5,066 1,758 5,125 1,629
Weighted average shares of Class C Common Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-diluted shares excluded from computation of earnings per share (in shares) 11 0 523 0
Employee Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-diluted shares excluded from computation of earnings per share (in shares) 0 0 139 0