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Revenue (Contract Assets and Liabilities) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Receivables, including unbilled receivables presented in prepaid expenses and other current assets $ 364,398 $ 333,044
Receivables, including unbilled receivables change 31,354  
Contract assets 38,339 32,125
Contract assets change 6,214  
Contract liabilities 37,859 $ 31,094
Contract liabilities change $ 6,765