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Fair Value Measurements (Details) (Recurring [Member], USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Level 1 [Member]
Fair value assets
Mutual funds	$ 12,816	$ 13,960	$ 13,146
Equities	5,746	9,336	7,456
Total asset	18,562	23,296	20,602
Level 2 [Member]
Fair value assets
Medium-term investments	0	0	3,910
Common/collective trust funds	1,965	2,431	2,361
Total asset	1,965	2,431	3,227
Fair value liabilities
Interest rate swaps	$ 0	$ 0	$ (3,044)

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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