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Revenue Revenue (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Disaggregation of Revenue [Line Items]    
Number of Types of Performance Obligations 2  
Contract with Customer, Liability, Revenue Recognized   $ 20,200,000
Contract with Customer, Refund Liability $ 0  
Stand Ready Performance Obligations [Member]    
Disaggregation of Revenue [Line Items]    
Revenue, Performance Obligation, Description of Good or Service those that require us to stand ready to provide goods and services to a customer to use as and when requested (“Stand Ready Performance Obligations”)  
Other Performance Obligations [Member]    
Disaggregation of Revenue [Line Items]    
Revenue, Performance Obligation, Description of Good or Service those that do not require us to stand ready (“Other Performance Obligations”)