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Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Allowance for trade and other receiveables	$ 683	$ 535
Property plant and equipment accumulated depreciation	526,858	504,442
Intangible assets accumulated amortization	$ 274,633	$ 263,305

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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