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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At A Fair Value On Recurring Basis) (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to share-based compensation liabilities $ 450,000 [1] $ 3,562,000 [1]
Share-based compensation liabilities 445,000 [2] 3,562,000 [2]
Interest rate swaps liability 1,577,000 [2] 2,053,000 [2]
Fair Value, Inputs, Level 1 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to share-based compensation liabilities 450,000 [1] 3,562,000 [1]
Share-based compensation liabilities 445,000 [2] 3,562,000 [2]
Fair Value, Inputs, Level 2 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps liability 1,577,000 [2] 2,053,000 [2]
Fair Value, Inputs, Level 3 [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to share-based compensation liabilities    [1]    [1]
Share-based compensation liabilities    [2]    [2]
Interest rate swaps liability    [2]    [2]
[1] Included in other assets in the accompanying consolidated balance sheets.
[2] Included in accounts payable and accrued liabilities in the accompanying consolidated balance sheets.