Quarterly report pursuant to Section 13 or 15(d)

Revenue (Obligation) (Details)

v3.10.0.1
Revenue (Obligation) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Revenue  
Total $ 511,163
Unsatisfied performance obligations true
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01  
Revenue  
Total $ 105,353
Remaining Performance Obligations  
Revenue recognition period 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue  
Total $ 164,482
Remaining Performance Obligations  
Revenue recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue  
Total $ 92,639
Remaining Performance Obligations  
Revenue recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue  
Total $ 53,793
Remaining Performance Obligations  
Revenue recognition period 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01  
Revenue  
Total $ 54,122
Remaining Performance Obligations  
Revenue recognition period 1 year