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Condensed Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Allowance for trade and other receiveables	$ 210	$ 405
Property plant and equipment accumulated depreciation	426,227	406,773
Intangible assets accumulated amortization	$ 211,975	$ 199,248

- 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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