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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans We sponsor two noncontributory defined benefit pension plans, as well as two non-qualified Supplemental Executive Retirement Plans ("SERPs"). Both of the defined benefit plans and the SERPs have frozen the accrual of future benefits. We sponsor a defined contribution plan covering substantially all non-union and certain union employees. We match a portion of employees' voluntary contributions to this plan. The components of the expense consisted of the following:
|  | Three Months Ended March 31,
(in thousands) |  | 2018 |  | 2017
Interest cost |  | $ | 5,925 |  |  | $ | 6,486 |
Expected return on plan assets, net of expenses |  | (5,732 | ) |  | (4,360 | )
Amortization of actuarial loss |  | 921 |  |  | 1,084 |
Total for defined benefit plans |  | 1,114 |  |  | 3,210 |
Multi-employer plans |  | 47 |  |  | 74 |
SERPs |  | 274 |  |  | 257 |
Defined contribution plan |  | 2,793 |  |  | 2,904 |
Net periodic benefit cost |  | 4,228 |  |  | 6,445 |
Allocated to discontinued operations |  | (203 | ) |  | (191 | )
Net periodic benefit cost — continuing operations |  | $ | 4,025 |  |  | $ | 6,254 |
We contributed $1.6 million to fund current benefit payments for our SERPs and $1.3 million for our defined benefit pension plans during the three months ended March 31, 2018. During the remainder of 2018, we anticipate contributing an additional $4.9 million to fund the SERPs' benefit payments and an additional $16.1 million to fund our qualified defined benefit pension plans.

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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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