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Other Current Assets (Other Current Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Current Assets [Abstract]
Deposits in trusts for employee benefits and retirement plans	$ 91,388	$ 87,646
Other	58,393	57,791
Other current assets	$ 149,781	$ 145,437

The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate within one year of the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

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