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Mandatorily Redeemable Preferred Stock (Changes In The Number Of Preferred Stock Outstanding) (Details)
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Series B Preferred Stock [Member]
       
Temporary Equity [Line Items]        
Shares outstanding, beginning 0 0 3,160 6,160
Shares redeemed 0 (3,160) (3,000)  
Preferred stock, outstanding 0 0 3,160 6,160
Shares outstanding, ending 0 0 3,160 6,160
Series C Preferred Stock [Member]
       
Temporary Equity [Line Items]        
Shares outstanding, beginning 0 5,000 5,000 5,000
Shares redeemed (5,000) 0 0  
Preferred stock, outstanding 0 5,000 5,000 5,000
Shares outstanding, ending 0 5,000 5,000 5,000