Pension and Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2019

General Discussion Of Pension And Other Postretirement Benefits [Abstract]

Pension [Table Text Block]

	Three Months Ended September 30,								Nine Months Ended September 30,
					Other								Other
					Postretirement								Postretirement
	Pension Benefits				Benefits				Pension Benefits				Benefits
		2019		2018		2019		2018		2019		2018		2019		2018
Service cost	$	993	$	938	$	2	$	—	$	2,956	$	2,886	$	5	$	5
Interest cost		1,852		1,015		36		31		4,068		3,096		107		97
Expected return on plan assets		(2,140)		(1,229)		—		—		(4,102)		(3,793)		—		—
Actuarial loss amortization		799		782		—		2		2,348		2,375		—		31
Prior service cost amortization		(34)		(28)		—		—		(117)		(88)		—		—
Net periodic benefit cost	$	1,470	$	1,478	$	38	$	33	$	5,153	$	4,476	$	112	$	133