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Litigation, Commitments and Contingencies - Sold Accounts Receivable Litigation Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 15, 2018
purchaser
Loss Contingencies [Line Items]      
Accounts receivable sold $ 1.2    
Proceeds from sale of accounts receivable $ 1.1    
Repurchase of accounts receivable, term 5 months    
Repurchase of accounts receivable, interest rate 2.00%    
Sold Accounts Receivable Litigation | Obligation to Repurchase Receivables Sold      
Loss Contingencies [Line Items]      
Number of accounts receivable purchasers with outstanding demands | purchaser     2
Loss contingency, damages sought   $ 0.5