Quarterly report pursuant to Section 13 or 15(d)

REVENUE -Remaining Performance Obligations (Details)

v3.19.2
REVENUE -Remaining Performance Obligations (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Transaction price allocated to the remaining performance obligations  
Remaining performance obligation $ 409,019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01  
Transaction price allocated to the remaining performance obligations  
Remaining performance obligation $ 77,521
Expected timing of satisfaction 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Transaction price allocated to the remaining performance obligations  
Remaining performance obligation $ 129,521
Expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Transaction price allocated to the remaining performance obligations  
Remaining performance obligation $ 99,112
Expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Transaction price allocated to the remaining performance obligations  
Remaining performance obligation $ 102,865
Expected timing of satisfaction