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Cash Equivalents And Restricted Cash And Securities (Summary Of Cash Equivalents And Restricted Cash And Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cost Basis | $ 44,827 | $ 32,413 | $ 37,588 | $ 33,375
Unrealized Holding Gains | 0 | $ 0 |  |
Cash [Member] | Restricted Cash And Securities [Member] |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cost Basis |  |  | $ 5,000 |
Unrealized Holding Gains |  |  |  |
Estimated Market Value |  |  | $ 5,000 |
Money Market Funds [Member] | Cash Equivalents [Member] |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cost Basis | $ 714 |  | $ 549 |
Unrealized Holding Gains |  |  |  |
Estimated Market Value | $ 714 |  | $ 549 |
Money Market Funds [Member] | Restricted Cash And Securities [Member] |  |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |  |
Cost Basis | $ 812 |  | $ 830 |
Unrealized Holding Gains |  |  |  |
Estimated Market Value | $ 812 |  | $ 830 |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain (loss) recognized in the income statement on unsold other securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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