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Pension and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2014
Pension and Other Postretirement Benefit Plans | Pension and Other Postretirement Benefit Plans The components of net periodic cost are as follows:
| Three Months Ended March 31, 2014
(in thousands) | Pension Benefits |  | Other Postretirement Benefits
| 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 1,258 |  |  | $ | 1,529 |  |  | $ | 17 |  |  | $ | 27 |
Interest cost | 10,234 |  |  | 9,410 |  |  | 101 |  |  | 125 |
Expected return on plan assets | (15,713 | ) |  | (13,212 | ) |  | — |  |  | — |
Amortization of prior service cost | 30 |  |  | (6 | ) |  | (59 | ) |  | (59 | )
Amortization of net loss (gain) | 1,257 |  |  | 3,164 |  |  | (33 | ) |  | (35 | )
Net periodic cost | $ | (2,934 | ) |  | $ | 885 |  |  | $ | 26 |  |  | $ | 58 |
The Company expects, based on current actuarial calculations, to contribute approximately $24 million to its defined benefit plans and $1 million to its other postretirement benefit plans in 2014, of which $2.6 million and $0.3 million have been contributed during the first three months of 2014, respectively. The Company contributed $15 million to its defined benefit plans and $1 million to its other postretirement benefit plans in 2013. Cash contributions for subsequent years will depend on a number of factors, including the impact of the Pension Protection Act signed into law in 2006, changes in minimum funding requirements, long-term interest rates, the investment performance of plan assets and changes in employee census data affecting the Company’s projected benefit obligations.

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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-Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS88 -Paragraph 63 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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