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Employee Benefit Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2014
Employee Benefit Plans and Other Postretirement Benefits [Abstract] |
Employee Benefit Plans and Other Postretirement Benefits | Employee Benefit Plans and Other Postretirement Benefits The components of net periodic benefit cost were as follows (dollars in thousands):
| Pension Plans |  | Postretirement Plans
| Three Months Ended March 31 |  | Three Months Ended March 31
| 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 5,794 |  |  | $ | 6,249 |  |  | $ | 392 |  |  | $ | 515 |
Interest cost | 11,434 |  |  | 3,991 |  |  | 308 |  |  | 311 |
Expected return on plan assets | (12,679 | ) |  | (3,751 | ) |  | — |  |  | — |
Net amortization of unrecognized amounts |  |  |  |  |  |  |
Prior service cost | 1,641 |  |  | 1,560 |  |  | (57 | ) |  | (106 | )
Actuarial loss | 155 |  |  | 1,502 |  |  | 24 |  |  | 134 |
Net periodic benefit cost | $ | 6,345 |  |  | $ | 9,551 |  |  | $ | 667 |  |  | $ | 854 |
PCA makes pension plan contributions that are sufficient to fund its actuarially determined costs, generally equal to the minimum amounts required by the Employee Retirement Income Security Act (ERISA). In 2014, we expect to contribute the required minimum, which we estimate to be approximately $5.0 million.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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