Fair Value Measurements (Assets And Liabilities Measured On Recurring Basis) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Investments in grantor trusts	$ 15,270	$ 15,055
Total assets	22,973	84,202
Deferred compensation plan obligations	15,270	15,055
Total liabilities	15,447	15,163
Significant Other Observable Inputs (Level 2) [Member] \| Tax Increment Revenue Bonds [Member]
Investments		51,255
Significant Unobservable Inputs (Level 3) [Member] \| Tax Increment Revenue Bonds [Member]
Investments		10,700
Tax Increment Revenue Bonds [Member]
Investments		61,955
Significant Other Observable Inputs (Level 2) [Member] \| Interest Rate Contracts [Member]
Interest rate contracts	7,703	7,192
Interest rate contracts	177	108
Interest Rate Contracts [Member]
Interest rate contracts	7,703	7,192
Interest rate contracts	177	108
Quoted Prices In Active Markets For Identical Assets And Liabilities (Level1) [Member]
Investments in grantor trusts	15,270	15,055
Total assets	15,270	15,055
Deferred compensation plan obligations	15,270	15,055
Total liabilities	15,270	15,055
Significant Other Observable Inputs (Level 2) [Member]
Total assets	7,703	58,447
Total liabilities	177	108
Significant Unobservable Inputs (Level 3) [Member]
Total assets		$ 10,700

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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