Investment In Partnerships (Investments in Partnerships) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Total	$ 1,324	$ 2,091
Signison [Member]
Schedule of Equity Method Investments [Line Items]
Total	1,138	865
Soundperience [Member]
Schedule of Equity Method Investments [Line Items]
Total		1,022
Other Investment [Member]
Schedule of Equity Method Investments [Line Items]
Total	$ 186	$ 204