Pension Plan (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Schedule of net benefit cost

Net periodic pension cost consists of the following: 

	Three Months Ended September 30,				Nine Months Ended September 30,
	2020		2019		2020		2019
Service cost	$	179	$	253	$	537	$	759
Interest cost on projected benefit obligation	639		782		1,917		2,346
Expected return on plan assets	(1,255)		(1,181)		(3,765)		(3,543)
Net amortization and deferral	705		720		2,115		2,160
Net periodic pension cost	$	268	$	574	$	804	$	1,722