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Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Payment of dividends					$ 15,654
Battle Creek [Member]
Related Party Transaction [Line Items]
Related party revenues	$ 34	$ 11	$ 76	$ 69
Related party expenses	0	0	0	0
NDFB [Member]
Related Party Transaction [Line Items]
Royalties	375	$ 357	682	$ 651
Accrued royalties	$ 166		$ 166			$ 99