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Revenue - Performance Obligations (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Revenue  
Future revenue related to current unsatisfied performance obligations $ 32,914
Remaining performance obligations true
Original expected durations true
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01  
Revenue  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 6 months
Future revenue related to current unsatisfied performance obligations $ 6,961
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 6 months
Future revenue related to current unsatisfied performance obligations $ 9,327
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 6 months
Future revenue related to current unsatisfied performance obligations $ 5,183
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 6 months
Future revenue related to current unsatisfied performance obligations $ 11,443