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Contract Assets and Contract Liabilities (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Contract Assets  
Balance at beginning of year $ 366,168
Recognized in current year 49,414
Reclassified to accounts receivable (39,375)
Foreign currency impact 6,573
Balance at end of period 382,780
Contract Liabilities  
Balance at beginning of year 463,704
Recognized in current year 23,488
Amounts in beginning balance reclassified to revenue (29,297)
Current year amounts reclassified to revenue (1,028)
Foreign currency impact 7,424
Balance at end of period $ 464,291