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Revenues (Contract Liabilities) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract with customer, liability $ 98 $ 98
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract with customer, liability $ 49  
Revenue, remaining performance obligation, expected timing of satisfaction, period 9 months  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract with customer, liability $ 49  
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Contract with customer, liability $ 0  
Revenue, remaining performance obligation, expected timing of satisfaction, period 1 year