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Employee Benefit Plans
 9 Months Ended
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.