Fair Value Measurements (Schedule Of Assets And Liabilities Measured At A Fair Value On Recurring Basis) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments related to share-based compensation liabilities	$ 412,000	[1]	$ 450,000	[1]
Share-based compensation liabilities	404,000	[2]	445,000	[2]
Interest rate swaps liability	752,000	[2]	1,577,000	[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	412,000	[1]	450,000	[1]
Share-based compensation liabilities	404,000	[2]	445,000	[2]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps liability	752,000	[2]	1,577,000	[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.