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Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
I. Cash paid during the period for:
Interest	$ 81,821	$ 83,677	$ 67,918
Income taxes	27,693	53,074	41,523
II. Non-cash investing and financing activities:
Issuance of stock dividend	414	378	357
Debt retired in debt conversion	$ 55,778	$ 10,993	$ 0

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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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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- Definition

The value of notes retired (or transferred to another entity) in noncash investing or financing transactions.

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