Employee Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2019

Pension plan

Employee retirement plans

Schedule of components of net periodic pension or other postretirement benefit cost

	Three Months Ended				Six Months Ended
	June 30,		June 30,		June 30,		June 30,
	2019		2018		2019		2018
Component of net periodic pension cost:
Service cost	$	-	$	102	$	-	$	204
Interest cost		410		389		820		778
Expected return on plan assets		(294)		(475)		(588)		(950)
Amortization of net loss		149		176		298		352
Net periodic pension cost	$	265	$	192	$	530	$	384

Other postretirement benefit cost

Employee retirement plans

Schedule of components of net periodic pension or other postretirement benefit cost

	Three Months Ended				Six Months Ended
	June 30,		June 30,		June 30,		June 30,
	2019		2018		2019		2018
Component of periodic other postretirement benefit cost:
Service cost	$	37	$	47	$	74	$	94
Interest cost		63		58		126		116
Amortization of net gain		(78)		(52)		(156)		(104)
Net periodic other postretirement benefit cost	$	22	$	53	$	44	$	106