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Cash Equivalents And Restricted Securities (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | $ 776,000 | $ 699,000 |
Gross realized gains or losses on cash equivalents | 0 | 0 | $ 0
Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | 776,000 | 699,000 |
Maturity Date Within Three Months [Member] | Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | 537,000 | 490,000 |
Maturity Date Between Three Months And One Year [Member] | Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | $ 239,000 | $ 209,000 |
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 |

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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031664&loc=d3e22529-158502 + Details
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