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Investments in Securities and Fair Value Investments in Securities (Schedule of Cost-method Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Measurement Alternative Investments
Beginning of Period	$ 5,439	$ 4,744
Amounts Impairment	0	0
Observable Changes	0	0
Purchases and Additional Commitments Paid	1,486	1,082
Sales, Returns of Capital, and Other Reductions	(336)	(387)
End of Period	$ 6,589	$ 5,439

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Amount of investment in equity method investee and investment in and advance to affiliate.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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