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Employee Benefit Plans | 9 Months Ended
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Sep. 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. The components of the expense consisted of the following:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(in thousands) |  | 2017 |  | 2016 |  | 2017 |  | 2016
Interest cost |  | $ | 6,504 |  |  | $ | 6,839 |  |  | $ | 19,475 |  |  | $ | 20,379 |
Expected return on plan assets, net of expenses |  | (4,360 | ) |  | (4,616 | ) |  | (13,079 | ) |  | (13,812 | )
Amortization of actuarial loss |  | 1,150 |  |  | 1,102 |  |  | 3,318 |  |  | 3,097 |
Total for defined benefit plans |  | 3,294 |  |  | 3,325 |  |  | 9,714 |  |  | 9,664 |
Multi-employer plans |  | 58 |  |  | 42 |  |  | 191 |  |  | 127 |
SERPs |  | 257 |  |  | 280 |  |  | 771 |  |  | 840 |
Defined contribution plan |  | 2,300 |  |  | 2,073 |  |  | 7,161 |  |  | 6,347 |
Net periodic benefit cost |  | $ | 5,909 |  |  | $ | 5,720 |  |  | $ | 17,837 |  |  | $ | 16,978 |
We contributed $1.3 million to fund current benefit payments for our SERPs and $18.0 million for our defined benefit pension plans during the nine months ended September 30, 2017. During the remainder of 2017, we anticipate contributing an additional $0.3 million to fund the SERPs' benefit payments and an additional $1.3 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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