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EMPLOYEE BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS The Company has four qualified non-contributory defined benefit pension plans covering a significant majority of its employees and an unfunded plan that provides benefits in excess of amounts allowable under current tax law in the qualified plans. Currently, all qualified plans are closed to new participants. Employee benefit plan liabilities are calculated using actuarial estimates and management assumptions. These estimates are based on historical information, along with certain assumptions about future events. Changes in assumptions, as well as changes in actual experience, could cause the estimates to change. The net pension and postretirement benefit costs that have been recorded are shown in the following tables:
| Pension |  | Postretirement
| Three Months Ended March 31, |  | Three Months Ended March 31,
| 2014 |  | 2013 |  | 2014 |  | 2013
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |
Service cost | $ | 1,624 |  |  | $ | 2,419 |  |  | $ | 179 |  |  | $ | 249 |
Interest cost | 4,683 |  |  | 4,834 |  |  | 206 |  |  | 240 |
Expected return on plan assets | (6,658 | ) |  | (7,424 | ) |  | — |  |  | — |
Amortization of prior service cost | 292 |  |  | 388 |  |  | 4 |  |  | 6 |
Amortization of losses | 2,737 |  |  | 5,727 |  |  | 129 |  |  | 218 |
Amortization of negative plan amendment | — |  |  | — |  |  | (134 | ) |  | — |
Net periodic benefit cost | $ | 2,678 |  |  | $ | 5,944 |  |  | $ | 384 |  |  | $ | 713 |
In 2014, the Company has no mandatory pension contribution requirements, but may make discretionary contributions.

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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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