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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2017
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. 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 June 30, |  | Six Months Ended June 30,
(in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Interest cost |  | $ | 6,486 |  |  | $ | 6,770 |  |  | $ | 12,971 |  |  | $ | 13,540 |
Expected return on plan assets, net of expenses |  | (4,360 | ) |  | (4,599 | ) |  | (8,720 | ) |  | (9,196 | )
Amortization of actuarial loss |  | 1,084 |  |  | 997 |  |  | 2,168 |  |  | 1,995 |
Total for defined benefit plans |  | 3,210 |  |  | 3,168 |  |  | 6,419 |  |  | 6,339 |
Multi-employer plans |  | 59 |  |  | 42 |  |  | 133 |  |  | 85 |
SERPs |  | 257 |  |  | 281 |  |  | 515 |  |  | 560 |
Defined contribution plan |  | 1,957 |  |  | 2,086 |  |  | 4,861 |  |  | 4,274 |
Net periodic benefit cost |  | $ | 5,483 |  |  | $ | 5,577 |  |  | $ | 11,928 |  |  | $ | 11,258 |
We contributed $0.5 million to fund current benefit payments for our SERPs and $6.2 million for our defined benefit pension plans during the six months ended June 30, 2017. During the remainder of 2017, we anticipate contributing an additional $1.0 million to fund the SERPs' benefit payments and an additional $10.0 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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