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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [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. Other union-represented employees are covered by defined benefit pension plans jointly sponsored by us and the union, or by union-sponsored multi-employer plans. The components of the expense consisted of the following:
|  | Three Months Ended March 31,
(in thousands) |  | 2017 |  | 2016
Interest cost |  | $ | 6,486 |  |  | $ | 6,770 |
Expected return on plan assets, net of expenses |  | (4,360 | ) |  | (4,597 | )
Amortization of actuarial loss |  | 1,084 |  |  | 998 |
Total for defined benefit plans |  | 3,210 |  |  | 3,171 |
Multi-employer plans |  | 74 |  |  | 43 |
SERPs |  | 257 |  |  | 279 |
Defined contribution plan |  | 2,904 |  |  | 2,188 |
Net periodic benefit cost |  | $ | 6,445 |  |  | $ | 5,681 |
We contributed $0.2 million to fund current benefit payments for our SERPs and $1.1 million for our defined benefit pension plans during the three months ended March 31, 2017. During the remainder of 2017, we anticipate contributing an additional $1.4 million to fund the SERPs' benefit payments and an additional $16.4 million to fund our qualified defined benefit pension plans.

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