Investment In Partnerships (Narrative) (Details) € in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
Jan. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Soundperience GmbH [Member]
Schedule of Equity Method Investments [Line Items]
Cost method, ownership interest		16.00%
Equity investment, cash advance and license agreement \| $		$ 1,415
Signison [Member]
Schedule of Equity Method Investments [Line Items]
Equity method, ownership interest		50.00%
Subsequent Event [Member] \| Soundperience GmbH [Member]
Schedule of Equity Method Investments [Line Items]
Acquisition of remaining percentage stake	49.00%
Cost method, ownership interest	33.00%
Purchase price \| €	€ 1,500

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Equity Investment, Cash Advance and License Agreement

+ References

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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-Name Accounting Standards Codification
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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