Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 1
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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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This element represents the current portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions.

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Cash Equivalents And Restricted Cash And Securities (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	$ 699,000	$ 830,000
Restricted cash		5,000,000
Gross realized gains or losses on cash equivalents	0	0	$ 0
Cash [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	0	5,000,000
Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	699,000	830,000
Maturity Date Within Three Months [Member] \| Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	490,000	595,000
Maturity Date Between Three Months And One Year [Member] \| Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	$ 209,000	$ 235,000
Minimum [Member] \| Maturity Date Between Three Months And One Year [Member] \| Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities maturity period	3 months	3 months
Maximum [Member] \| Maturity Date Within Three Months [Member] \| Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities maturity period	3 months	3 months
Maximum [Member] \| Maturity Date Between Three Months And One Year [Member] \| Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities maturity period	1 year	1 year