Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Other Intangible Assets [Abstract]
Ribasphere product rights, Remaining Useful Life			1 year 3 months
Ribasphere product rights, Impairment			$ 31,300
Amortization expense		15,223	$ 27,442
Accumulated amortization	$ (140,700)	$ (140,700)