Intangible Assets Intangible (Details textual ) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Disposal Group, Including Discontinued Operation, Assets, Current	$ 2,032	$ 67,344
Fishing Hot Spot [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	2,163
Fishidy [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 3,782
Prox Dynamics, AS [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		31,400	$ 123,100
Consumer and Small and Medium-Sized Security Business [Member] | Held-for-sale [Member] | Acquired Intangible Assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets, net		$ 8,359