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Employee Benefit Plans and Other Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2014
Pension Plans |
Components of Net Periodic Benefit Costs | The components of net periodic benefit cost for our pension plans were as follows (dollars in thousands):
| Pension Plans
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 5,828 |  |  | $ | 5,825 |  |  | $ | 17,428 |  |  | $ | 18,322 |
Interest cost | 11,507 |  |  | 4,269 |  |  | 34,400 |  |  | 12,250 |
Expected return on plan assets | (12,657 | ) |  | (3,796 | ) |  | (38,008 | ) |  | (11,297 | )
Net amortization of unrecognized amounts |  |  |  |  |  |  |
Prior service cost | 1,641 |  |  | 163 |  |  | 4,922 |  |  | 3,284 |
Actuarial loss | 155 |  |  | 2,217 |  |  | 465 |  |  | 5,221 |
Curtailment loss (a) | — |  |  | 3,132 |  |  | — |  |  | 10,908 |
Net periodic benefit cost | $ | 6,474 |  |  | $ | 11,810 |  |  | $ | 19,207 |  |  | $ | 38,688 |
___________
(a) | In June 2013, the United Steelworkers (“USW”) ratified a master labor agreement with PCA under which we froze certain USW-represented corrugated plant employees pension accruals under PCA’s hourly pension plan. Additionally, in September 2013, the USW ratified a master labor agreement with PCA under which we froze certain USW-represented containerboard mill employees pension accruals under PCA’s hourly pension plan. Following the pension freezes, affected USW-represented employees will transition to a defined contribution 401k plan. We recorded a $3.1 million and $10.9 million pre-tax pension curtailment charge related to the unrecognized prior service costs of employees impacted by the pension freezes during the three and nine months ended September 30, 2013, respectively. We also remeasured the hourly pension plan benefit obligation using current fair values of plan assets and current assumptions, resulting in a decrease in the benefit obligation of $21.9 million with a corresponding decrease in accumulated other comprehensive income (loss) of $13.4 million and deferred taxes of $8.5 million.
Postretirement Plans |
Components of Net Periodic Benefit Costs | The components of net periodic benefit cost for our postretirement plans were as follows (dollars in thousands):
| Postretirement Plans
| Three Months Ended September 30 |  | Nine Months Ended September 30
| 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 392 |  |  | $ | 515 |  |  | $ | 1,177 |  |  | $ | 1,545 |
Interest cost | 311 |  |  | 311 |  |  | 933 |  |  | 934 |
Net amortization of unrecognized amounts |  |  |  |  |  |  |
Prior service benefit | (57 | ) |  | (106 | ) |  | (170 | ) |  | (319 | )
Actuarial loss | 26 |  |  | 134 |  |  | 77 |  |  | 401 |
Net periodic benefit cost | $ | 672 |  |  | $ | 854 |  |  | $ | 2,017 |  |  | $ | 2,561 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration