Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]

Net Periodic Cost (Benefit)
	Pension Benefits						Other  Postretirement  Benefits
	Three Months Ended June 30,						Three Months Ended June 30,
	2018			2017			2018			2017
Service cost	$	1		$	1		$	—		$	—
Interest cost	36			49			1			2
Expected return on plan assets	(59		)	(80		)	(1		)	(2		)
Amortization of prior service credit	—			—			(2		)	(2		)
Amortization of actuarial loss	13			15			2			1
Settlements	—			750			—			—
Net periodic cost (benefit)	$	(9	)	$	735		$	—		$	(1	)

Net Periodic Cost (Benefit)
	Pension Benefits						Other  Postretirement  Benefits
	Six months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Service cost	$	2		$	2		$	—		$	—
Interest cost	71			98			3			4
Expected return on plan assets	(115		)	(159		)	(3		)	(4		)
Amortization of prior service credit	—			—			(3		)	(3		)
Amortization of actuarial loss	25			30			3			2
Settlements	—			750			—			—
Net periodic cost (benefit)	$	(17	)	$	721		$	—		$	(1	)