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Supplemental Disclosure of Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 491	$ 441	$ 2,399	$ 2,498
Income taxes paid	$ 3,183	$ 1,576	$ 16,465	$ 7,855

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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