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Trade Accounts Payable and Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Trade Accounts Payable and Accrued Expenses [Abstract]
Trade accounts payable	$ 13,387	$ 12,263
Accrued expenses	25,113	16,329
Trade accounts payable and accrued expenses	$ 38,500	$ 28,592

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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