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Revenue - Performance Obligations (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Remaining Performance Obligations  
Minimum value of unsatisfied performance obligations on term-based contracts $ 42,966
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Remaining Performance Obligations  
Remaining performance obligation period 24 months