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Revenue (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Receivables, including unbilled receivables presented in prepaid expenses and other current assets $ 353,992 $ 306,370
Receivables, including unbilled receivables change 47,622  
Contract assets 36,759 32,348
Contract assets change 4,411  
Contract liabilities 34,501 $ 34,888
Contract liabilities change $ (387)