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Revenue (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Revenue from Contract with Customer [Abstract]  
Outstanding performance obligation $ 132,337
Amounts included in contract liability at the beginning of period $ 37,206
Maintenance period 1 year
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Axis]: 2019-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation (as a precentage) 4.00%
Performance obligations expected to be satisfied, expected timing 12 months