Employee Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2017

Employee Retirement Plans [Abstract]

Net Periodic Benefit Expense

	Pension Benefits				Postretirement benefits
	Three months ended				Three months ended
	March 31,				March 31,
	2017		2016		2017		2016
Service cost	$	24	$	22	$	3	$	2
Interest cost		31		31		7		7
Expected return on plan assets		(43)		(42)
Amortization of prior service    cost (credit)		1		1		(1)		(1)
Recognition of actuarial loss				7
Total pension and postretirement    benefit expense	$	13	$	19	$	9	$	8