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Other Expense, Net (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Other Expense, Net [Line Items] |  |  |  |  |  |  |  |
DeRidder restructuring | $ 4,270 | [1] | $ 0 |  | $ 5,690 | [1] | $ 0 |
Integration-related and other costs | 3,040 | [2] | 0 |  | 11,999 | [2] | 0 |
Class action lawsuit settlement | 0 |  | 0 |  | 17,600 | [3] | 0 |
Pension curtailment charges | 0 |  | 3,132 | [4] | 0 |  | 10,908 | [4]
Acquisition-related costs | 0 |  | 1,479 | [5] | 0 |  | 1,479 | [5]
Asset disposals and write-offs | 2,854 |  | 3,486 |  | 6,912 |  | 9,508 |
Other | 2,146 |  | (376) |  | 1,803 |  | 615 |
Total | 12,310 |  | 7,721 |  | 44,004 |  | 22,510 |
Corporate and Other |  |  |  |  |  |  |  |
Other Expense, Net [Line Items] |  |  |  |  |  |  |  |
Class action lawsuit settlement |  |  |  |  | $ 17,600 | [3] |  |
[1] | Costs relate primarily to the conversion of the Number 3 newsprint machine at our DeRidder, Louisiana, mill to produce lightweight linerboard and corrugating medium, and our exit from the newsprint business in September 2014.
[2] | The three and nine months ended September 30, 2014, include Boise acquisition integration-related and other costs.
[3] | The nine months ended September 30, 2014, includes $17.6 million of costs 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.
[4] | The three and nine months ended September 30, 2013, include $3.1 million and $10.9 million, respectively, of non-cash pension curtailment charges related to pension plan changes in which certain hourly corrugated plant and containerboard mill employees will transition from a defined benefit pension plan to a defined contribution (401k) plan.
[5] | The three and nine months ended September 30, 2013, both include $1.5 million of acquisition-related costs, primarily for professional fees related to transaction-advisory services and expenses related to financing the acquisition of Boise.

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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