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Revenue From Contracts With Customers Performance Obligation (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 167,851
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 53,078
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligations, expected timing of satisfaction 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligations $ 38,071
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligations, expected timing of satisfaction 2 years