Revenue Recognition (Schedule of Remaining Performance Obligations) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Performance obligations, amount	$ 55,772
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue from Contract with Customer [Abstract]
Performance obligations, amount	$ 53,945
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations , period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue from Contract with Customer [Abstract]
Performance obligations, amount	$ 904
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations , period	2 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations , period