Deferred Charges, Goodwill and Other Assets (Summary Of Notional Amount And Fair Value Of Derivative Financial Instruments) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Derivatives, Fair Value [Line Items]      
Fair Value $ 32,000   $ 95,000
Interest and other investment income (loss) 267,000 386,000  
Gain (Loss) on Derivative Instruments [Member]      
Derivatives, Fair Value [Line Items]      
Interest and other investment income (loss) (63,000)    
LIBOR Cap One [Member]      
Derivatives, Fair Value [Line Items]      
Notional Value 51,000,000 [1]    
Strike Rate 1.50%    
Effective Date Sep. 01, 2014    
Expiration Date Oct. 01, 2015    
Fair Value 1,000   1,000
LIBOR Cap Two [Member]      
Derivatives, Fair Value [Line Items]      
Notional Value 24,000,000 [1]    
Strike Rate 1.50%    
Effective Date Sep. 01, 2014    
Expiration Date Oct. 01, 2015    
Fair Value 1,000   1,000
LIBOR Cap Three [Member]      
Derivatives, Fair Value [Line Items]      
Notional Value 51,000,000 [1]    
Strike Rate 1.75%    
Effective Date Oct. 01, 2015    
Expiration Date Oct. 01, 2016    
Fair Value 20,000   64,000
LIBOR Cap Four [Member]      
Derivatives, Fair Value [Line Items]      
Notional Value 24,000,000 [1]    
Strike Rate 1.75%    
Effective Date Oct. 01, 2015    
Expiration Date Oct. 01, 2016    
Fair Value $ 10,000   $ 29,000
[1] The notional value is an indication of the extent of our involvement in these instruments at that time, but does not represent exposure to credit, interest rate or market risks.