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Shareholders' Equity (Schedule Of Dividends) (Details) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Class Of Stock [Line Items] |  |  |
Common stock | $ 0.200 | $ 0.200 | $ 0.200
Cumulative Redeemable Preferred Stock | $ 1.812 | $ 1.812 | $ 1.812
Series B [Member] |  |  |
Class Of Stock [Line Items] |  |  |
Dividend rate percentage | 7.25% |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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