Post-retirement Plan (Tables)

6 Months Ended

Jun. 30, 2018

Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]

Schedule of Costs of Retirement Plans [Table Text Block]

The net periodic pension expense of these plans consisted of the following components:

	Three Months Ended June 30,						Six Months Ended June 30,			February 1 to June 30,
	2018			2017			2018			2017
	(in thousands)
Service cost - benefit earned during the period	$	1,106		$	944		$	2,235		$	1,582
Interest cost on projected benefit obligations	563			518			1,138			868
Expected return on plan assets	(867		)	(747		)	(1,752		)	(1,252		)
Net periodic pension expense	$	802		$	715		$	1,621		$	1,198

Net Periodic Pension Expense

The net periodic benefit credit of these plans consisted of the following components:

	Three Months Ended June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
	(In thousands)
Service cost – benefit earned during the period	$	412		$	375		$	826		$	726
Interest cost on projected benefit obligations	234			243			471			464
Amortization of prior service credit	(870		)	(870		)	(1,741		)	(1,740		)
Net periodic post-retirement credit	$	(224	)	$	(252	)	$	(444	)	$	(550	)