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Summary of Significant Accounting Policies (Prepaid Expenses and Other) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Prepaid expense
Prepaid expenses	$ 5,275	$ 9,590
Inventory	11,526	4,443
Total prepaid expenses and other	$ 16,801	$ 14,033

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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