Quarterly report pursuant to Section 13 or 15(d)

Revenue - Obligation (Details)

v3.19.3
Revenue - Obligation (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 520,250
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 62,669
Remaining Performance Obligations  
Revenue recognition period 3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 182,307
Remaining Performance Obligations  
Revenue recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 115,379
Remaining Performance Obligations  
Revenue recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 76,483
Remaining Performance Obligations  
Revenue recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 46,268
Remaining Performance Obligations  
Revenue recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)  
Remaining Performance Obligations  
Revenue recognition period