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Cash Equivalents And Restricted Securities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | $ 808 |  | $ 776
Gross realized gains or losses on cash equivalents | 0 | $ 0 |
Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | 808 |  | 776
Maturity Date Within Three Months [Member] | Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | 246 |  | 537
Maturity Date Between Three Months And One Year [Member] | Money Market Funds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Restricted securities | $ 562 |  | $ 239
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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