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Fair Value Measurements (Schedule Of Assets And Liabilities Measured At A Fair Value On Recurring Basis) (Details) (USD $) | Jun. 30, 2012 | Dec. 31, 2011
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments related to deferred compensation liabilities | $ 416,000 | [1] | $ 3,562,000 | [1]
Deferred compensation liabilities | 415,000 | [2] | 3,562,000 | [2]
Interest rate swaps liability | 1,925,000 | [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 deferred compensation liabilities | 416,000 | [1] | 3,562,000 | [1]
Deferred compensation liabilities | 415,000 | [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 | 1,925,000 | [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 deferred compensation liabilities |  | [1] |  | [1]
Deferred 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.

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