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Commitments and Contingencies Litigation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revenues $ 51,775 $ 42,628  
Accounts receivable, net 31,434   $ 18,989
Pending Litigation [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Revenues 5,718    
Accounts receivable, net $ 17,078