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Long-Term Debt, Convertible Note (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 12 Months Ended
Apr. 18, 2018
Feb. 28, 2018
Mar. 31, 2018
Apr. 17, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 16, 2016
Convertible Debt [Abstract]                
Debt issuance costs         $ 0 $ 7,243 $ 0  
Loss on extinguishment of debt         $ 0 $ (7,220) $ 0  
Class A Common Stock [Member]                
Convertible Debt [Abstract]                
Shares issued (in shares)   1,535,652            
Convertible Note [Member]                
Convertible Debt [Abstract]                
Original principal amount               $ 210,000
Interest rate         4.75%      
Debt issuance costs         $ 6,600      
Additions to deferred financing cost         6,300      
Adjustments to additional paid-in capital for debt issuance costs         $ 300      
Payment for principal and accrued interest $ 213,400              
Accrued interest       $ 3,400        
Loss on extinguishment of debt     $ (7,200)