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Related Party Transactions Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2010
Mar. 31, 2019
Jan. 18, 2019
Dec. 31, 2018
Dec. 01, 2016
Rhapsody America LLC          
Related Party Transaction [Line Items]          
Percentage of shares acquired     42.00%    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage     84.00%    
Rhapsody America LLC          
Related Party Transaction [Line Items]          
Payments for restructuring $ 18.0        
Liquidation preference amount   $ 10.0      
Percentage of ownership interest in Rhapsody       42.00%  
Loan principal to related party         $ 5.0
Notes Payable, Related Parties, Aggregate Amount         $ 10.0
Note payable, Related Parties, Interest Rate         15.00%