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Accrued Expenses and Other Current Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued expenses and other current liabilities
Accrued salary, bonus, and related benefits	$ 29,438	$ 21,744
Accrued marketing costs (1)	11,941	6,194
Accrued charitable foundation payments (2)	6,757	109
Other	15,100	9,222
Total accrued expenses and other current liabilities	$ 63,236	$ 37,269

Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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