Defined Benefit Pension Plans (Tables)

9 Months Ended

Sep. 30, 2018

Defined Benefit Plan [Abstract]

Schedule of Amounts Recognized in the Consolidated Balance Sheets

Amounts recognized on the Consolidated Balance Sheets consist of:

	September 30, 2018		December 31, 2017
	(in thousands)
Assets
Plan assets in other long-term assets	$	911	$	991
Liabilities
Current portion of pension benefit obligation in wages and benefits payable	3,091		3,260
Long-term portion of pension benefit obligation	96,081		95,717
Pension benefit obligation, net	$	98,261	$	97,986

Schedule of Net Periodic Pension Benefit Costs

Net periodic pension benefit costs for our plans include the following components:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
	(in thousands)
Service cost	$	1,008		$	994		$	3,025		$	2,846
Interest cost	567			568			1,767			1,628
Expected return on plan assets	(160		)	(152		)	(510		)	(445		)
Amortization of actuarial net loss	383			431			1,178			1,225
Amortization of unrecognized prior service costs	16			16			50			46
Net periodic benefit cost	$	1,814		$	1,857		$	5,510		$	5,300