Fair Value Disclosures (Fair Value Assets and Liabilities Measured on Recurring Basis) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member]
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Fair Value, Assets Measured on Recurring Basis, Derivative Financial Instruments, Assets		$ 4,856
Total assets		4,856
Derivative interest rate contract	(8,380)	(291)
Total liabilities	(8,380)	(291)
Fair Value, Inputs, Level 1 [Member]
Assets and liabilities measured at fair value on a recurring basis [Abstract]
Available-for-sale securities	2,081	2,061
Insurance deposit	10,713	10,135
Total assets	$ 12,794	$ 12,196

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.

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 investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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