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Cash Equivalents And Restricted Cash And Securities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	$ 491,000		$ 491,000		$ 528,000
Restricted cash	11,972,000		11,972,000		2,000,000
Gross realized gains or losses on cash equivalents	0	$ 0	0	$ 0
Maturity Date Within Three Months [Member] | Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	$ 491,000		$ 491,000		$ 528,000
Maximum [Member] | Maturity Date Within Three Months [Member] | Money Market Funds [Member] | Measurement Input, Expected Term [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities maturity period			3 months		3 months

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- Definition

Period between issuance and maturity of investment other than investment in equity security, investment in debt security and equity method investment, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of realized gain (loss) on investment.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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