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Debt, Convertible Note (Details)
3 Months Ended 4 Months Ended 6 Months Ended
Apr. 18, 2018
USD ($)
Feb. 28, 2018
shares
Jun. 16, 2016
USD ($)
Mar. 31, 2018
USD ($)
Apr. 17, 2018
USD ($)
Jun. 30, 2019
USD ($)
d
$ / shares
shares
Jun. 30, 2018
USD ($)
Convertible Debt [Abstract]              
Debt issuance costs           $ 0 $ 7,243,000
Loss on extinguishment of debt           $ 0 $ (7,220,000)
Class A Common Stock [Member]              
Convertible Debt [Abstract]              
Shares issued (in shares) | shares   1,535,652          
Convertible Note [Member]              
Convertible Debt [Abstract]              
Original principal amount     $ 210,000,000.0        
Interest rate           4.75%  
Maturity date           Jun. 15, 2020  
Redemption price, percentage of principal amount redeemed           100.00%  
Threshold percentage of stock price trigger           180.00%  
Threshold trading days | d           20  
Threshold final trading days | d           3  
Threshold consecutive trading days | d           30  
Principal amount increments that can be repurchased upon a change in control or termination of trading of common stock           $ 1,000  
Principal amount increments that can be converted           $ 1,000  
Holding period following issue date before notes can be converted           6 months  
Initial conversion rate (in shares) | shares           21.5054  
Initial conversion price (in dollars per share) | $ / shares           $ 46.50  
Proceeds from issuance of notes     210,000,000.0        
Liability component of convertible notes     199,100,000        
Equity component of convertible notes allocated to additional paid-in capital     $ 10,900,000        
Effective interest rate           7.10%  
Debt issuance costs           $ 6,600,000  
Additions to deferred financing cost           6,300,000  
Adjustments to additional paid-in capital for debt issuance costs           $ 300,000  
Payment for principal and accrued interest $ 213,400,000            
Accrued interest         $ 3,400,000    
Loss on extinguishment of debt       $ (7,200,000)