Quarterly report pursuant to Section 13 or 15(d)

Consolidated Condensed Balance Sheets (Parenthetical)

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Consolidated Condensed Balance Sheets (Parenthetical) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Current assets:    
Allowance for bad debts $ 2,877 $ 7,020
Accumulated depreciation and amortization on property, plant and equipment $ 945,527 $ 875,179