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Revenue - Remaining Performance Obligations (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 226,202
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, expected timing 1 year
Remaining performance obligations, percentage 75.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, expected timing 2 years
Remaining performance obligations, percentage 25.00%