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Other Assets And Deferred Charges (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Senior Notes-7.125% Due 2016 [Member]
Dec. 31, 2006
Senior Notes-7.125% Due 2016 [Member]
Dec. 31, 2010
Senior Notes-7.125% Due 2016 [Member]
Other Assets And Deferred Charges [Line Items]            
Additional financing fees $ 3,233,000 $ 3,992,000 $ 465,000 $ 3,000,000 $ 3,000,000  
Additional financing fees expensed 1,000,000     1,000,000    
Additional financing fees deferred 2,000,000          
Recognized amortization expense 1,603,000 1,467,000 1,247,000 1,000,000    
Senior notes, interest rate 7.125%     7.125%   7.125%
Accumulated amortization on deferred financing costs $ 3,000,000 $ 2,000,000