Pension and Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2019

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Schedule Of Net Benefit Costs [Table Text Block]

	Three Months Ended March 31,
					Other
	Pension Benefits				Postretirement Benefits
		2019		2018		2019		2018
Service cost	$	986	$	988	$	2	$	2
Interest cost		1,111		1,049		35		33
Expected return on plan assets		(984)		(1,290)		—		—
Actuarial loss amortization		775		800		—		15
Prior service cost amortization		(42)		(31)		—		—
Total net periodic benefit cost	$	1,846	$	1,516	$	37	$	50