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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans We sponsor noncontributory defined benefit pension plans and non-qualified Supplemental Executive Retirement Plans ("SERPs"). The accrual for future benefits has been frozen in our defined benefit pension plans and SERPs. 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 employee benefit plans expense consisted of the following:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Interest cost |  | $ | 5,800 |  |  | $ | 5,925 |  |  | $ | 11,600 |  |  | $ | 11,850 |
Expected return on plan assets, net of expenses |  | (5,058 | ) |  | (5,733 | ) |  | (10,116 | ) |  | (11,465 | )
Amortization of actuarial loss and prior service cost |  | 572 |  |  | 920 |  |  | 1,144 |  |  | 1,841 |
Total for defined benefit pension plans |  | 1,314 |  |  | 1,112 |  |  | 2,628 |  |  | 2,226 |
Multi-employer plans |  | 58 |  |  | 44 |  |  | 99 |  |  | 91 |
SERPs |  | 250 |  |  | 277 |  |  | 508 |  |  | 551 |
Defined contribution plan |  | 1,695 |  |  | 1,978 |  |  | 4,690 |  |  | 4,771 |
Net periodic benefit cost |  | 3,317 |  |  | 3,411 |  |  | 7,925 |  |  | 7,639 |
Allocated to discontinued operations |  | — |  |  | (174 | ) |  | — |  |  | (377 | )
Net periodic benefit cost — continuing operations |  | $ | 3,317 |  |  | $ | 3,237 |  |  | $ | 7,925 |  |  | $ | 7,262 |
We contributed $0.5 million to fund current benefit payments for our SERPs and $6.5 million for our defined benefit pension plans during the six months ended June 30, 2019. During the remainder of 2019, we anticipate contributing an additional $0.7 million to fund the SERPs' benefit payments and an additional $12.1 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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