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Supplemental Cash Flow Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash paid for interest and income taxes
Interest	$ 12,352	$ 13,020	$ 7,822
Income taxes	$ 16,250	$ 22,377	$ 18,412

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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