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Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Current Assets [Abstract]
Prepaid expenses	$ 20,790	$ 24,669
Interest and other receivables	27,076	16,297
Other current assets	9,745	8,192
Other Assets, Current	$ 57,611	$ 49,158

Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer.

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