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Revenue - Receivables (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total customer receivables $ 335,803 $ 313,719
Unbilled receivables 12,080 14,492
Billed receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total customer receivables $ 323,723 $ 299,227