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Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Gross Asset | $ 0 | $ 667
Total return swap | 1,690 | 785
Non-hedging derivatives [Member] | Interest rate swap agreements [Member] | Other Assets [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Gross Asset | 0 | 667
Total return swap | 0 | 0
Non-hedging derivatives [Member] | Interest rate swap agreements [Member] | Other liabilities [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Gross Asset | 0 | 0
Total return swap | 1,405 | 765
Non-hedging derivatives [Member] | Equity contracts [Member] | Other liabilities [Member] |  |
Derivative [Line Items] |  |
Derivative Liability, Fair Value, Gross Asset | 0 | 0
Total return swap | $ 285 | $ 20

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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