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Revenue (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Receivables, including unbilled receivables presented in prepaid expenses and other current assets $ 329,788 $ 306,370
Receivables, including unbilled receivables change 23,418  
Contract assets 33,778 32,348
Contract assets change 1,430  
Contract liabilities 32,961 $ 34,888
Contract liabilities change $ (1,927)