Components of Net Periodic Benefit Cost (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

	Three Months Ended June 30,								Six Months Ended June 30,
	(000's)								(000's)
	Pension Benefits				Post-Retirement Health Benefits				Pension Benefits				Post-Retirement Health Benefits
	2020		2019		2020		2019		2020		2019		2020		2019
Service cost	$	325	$	304	$	9	$	9	$	650	$	609	$	19	$	17
Interest cost	779		866		31		36		1,558		1,733		62		73
Expected return on plan assets	(1,049)		(896)		—		—		(2,099)		(1,793)		—		—
Net amortization of prior service cost	—		—		—		—		—		—		—		—
Net amortization of net (gain) loss	492		390		—		(4)		984		779		—		(8)
Net Periodic Benefit Cost	$	547	$	664	$	40	$	41	$	1,093	$	1,328	$	81	$	82