Goodwill (Summary of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017
Schedule Of Goodwill [Line Items]
Beginning Balance		$ 307,744
Goodwill, impairment loss	$ (304,100)	(304,123)
Acquisition of Gaiam, Inc. Branded Consumer Business [Member]
Schedule Of Goodwill [Line Items]
(Adjustment for) acquisition		$ (3,621)