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Consolidated Condensed Balance Sheets (Parenthetical) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for bad debts	$ 3,226	$ 7,020
Accumulated depreciation and amortization on property, plant and equipment	$ 921,314	$ 875,179

- 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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