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Shareholders' Equity (Schedule Of Dividends) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Class of Stock [Line Items]      
Common stock $ 0.200us-gaap_CommonStockDividendsPerShareCashPaid $ 0.200us-gaap_CommonStockDividendsPerShareCashPaid $ 0.200us-gaap_CommonStockDividendsPerShareCashPaid
Series A [Member]      
Class of Stock [Line Items]      
Cumulative Redeemable Preferred Stock     $ 2.219us-gaap_PreferredStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Dividend rate percentage 8.875%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Series B [Member]      
Class of Stock [Line Items]      
Cumulative Redeemable Preferred Stock $ 1.812us-gaap_PreferredStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
$ 1.812us-gaap_PreferredStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
$ 0.906us-gaap_PreferredStockDividendsPerShareCashPaid
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Dividend rate percentage 7.25%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember