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Liabilities for Dispositions and Discontinued Operations Analysis of Activity (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Accrual for Environmental Loss Contingencies [Roll Forward] |  |
Balance, beginning of period | $ 90,824 | $ 93,160
Expenditures charged to liabilities | (6,867) | (9,209)
Increase to liabilities | 496 | 6,873
Balance, end of period | 84,453 | 90,824
Less: Current portion | (8,929) | (9,931)
Non-current portion | $ 75,524 | $ 80,893

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