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Accounts Receivable - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accounts receivable, allowances for doubtful accounts $ 24,900 $ 23,300 $ 25,400
Bad debt expense 58,837 $ 5,790  
MAT sales reversal      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net sales reversal 30,000    
Accounts receivable reversal 87,000    
Bad debt expense $ 57,000