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Equity Method Investments (Schedule of Supplemental Financial Condition Information) (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets	$ 28,473,000	$ 18,177,000
Liabilities	7,692,000	1,003,000
Stockholder's Equity	20,781,000	17,174,000	$ 5,212,000
StockCross [Member]
Assets	514,925,000	595,091,000
Liabilities	499,211,000	577,528,000
Stockholder's Equity	$ 15,714,000	$ 17,563,000

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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