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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At A Fair Value On Recurring Basis) (Details) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments related to share-based compensation liabilities [1] $ 554,000 $ 492,000
Share-based compensation liabilities [2] 547,000 487,000
Interest rate swaps liability [2] 2,631,000 2,777,000
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 [1] 554,000 492,000
Share-based compensation liabilities [2] 547,000 487,000
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps liability [2] $ 2,631,000 $ 2,777,000
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]    
Share-based compensation liabilities [2]    
Interest rate swaps liability [2]    
[1] Included in other assets and deferred charges, net in the accompanying consolidated balance sheets.
[2] Included in accounts payable and accrued liabilities in the accompanying consolidated balance sheets.