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 pension 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 employee benefit plans expense consisted of the following:



	Three Months Ended June 30,						Six Months Ended June 30,
(in thousands)	2018			2017			2018			2017

Interest cost	$	5,925		$	6,486		$	11,850		$	12,971
Expected return on plan assets, net of expenses	(5,733		)	(4,360		)	(11,465		)	(8,720		)
Amortization of actuarial loss	920			1,084			1,841			2,168
Total for defined benefit pension plans	1,112			3,210			2,226			6,419
Multi-employer plans	44			59			91			133
SERPs	277			257			551			515
Defined contribution plan	1,978			1,957			4,771			4,861
Net periodic benefit cost	3,411			5,483			7,639			11,928
Allocated to discontinued operations	(174		)	(177		)	(377		)	(368		)
Net periodic benefit cost — continuing operations	$	3,237		$	5,306		$	7,262		$	11,560

We contributed $1.7 million to fund current benefit payments for our SERPs and $6.6 million for our defined benefit pension plans during the six months ended June 30, 2018. During the remainder of 2018, we anticipate contributing an additional $4.8 million to fund the SERPs' benefit payments and an additional $10.8 million to fund our qualified defined benefit pension plans.