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Contract Assets and Contract Liabilities (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
Contract Assets  
Balance at beginning of year $ 345,585
Acquisitions 213,605
Recognized in current year 324,940
Reclassified to accounts receivable (300,714)
Foreign currency impact (925)
Balance at end of period 582,491
Contract Liabilities  
Balance at beginning of year 444,805
Acquisitions 282,054
Recognized in current year 572,644
Amounts in beginning balance reclassified to revenue (251,980)
Current year amounts reclassified to revenue (257,640)
Foreign currency impact (867)
Balance at end of period $ 789,016