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Revenue (Transaction Price Allocated to Remaining Performance Obligation) (Details)
12 Months Ended
Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, percentage 35.00%
Performance obligations expected to be satisfied, expected timing P1Y
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, percentage 25.00%
Performance obligations expected to be satisfied, expected timing P1Y