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Other Expense, Net (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Other Expense, Net [Abstract] |  |  |
Class action lawsuit settlement (a) | $ 17,600 | [1] | $ 0
Integration-related costs (b) | 4,096 | [2] | 0
DeRidder restructuring (c) | 1,101 | [3] | 0
Asset disposals and write-offs | 1,260 |  | 2,779
Other | (75) |  | 1,182
Total | $ 23,982 |  | $ 3,961
[1] | The three months ended March 31, 2014, includes $17.6 million of costs accrued for the settlement of the Kleen Products LLC v Packaging Corp. of America et al class action lawsuit. See Note 18, Commitments, Guarantees, Indemnifications and Legal Proceedings, for more information.
[2] | The three months ended March 31, 2014, includes Boise acquisition integration-related costs, primarily for employee severance, professional fees, and other costs.
[3] | Costs relate primarily to our plans to convert the Number 3 newsprint machine at our DeRidder, Louisiana, mill to produce lightweight linerboard and corrugating medium and exit the newsprint business in mid-September 2014.

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