Pension Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Domestic and Foreign Pension and Postretirement Defined Benefit Plans

The components of pension and postretirement benefits cost (credit) for the three-month periods ended March 31, 2018 and 2017 were as follows (in thousands):

	Three Months Ended   March 31,
	2018			2017
Pension Benefits Cost (Credit):
Service cost	$	1,268		$	1,003
Interest cost	8,027			8,288
Expected return on assets	(10,764		)	(9,908		)
Amortization of prior service benefit	22			27
Total net pension benefits credit	$	(1,447	)	$	(590	)
Postretirement Benefits Cost (Credit):
Service cost	$	29		$	31
Interest cost	542			585
Expected return on assets	(2		)	(28		)
Amortization of prior service benefit	(12		)	(24		)
Total net postretirement benefits cost	$	557		$	564
Total net pension and postretirement benefits credit	$	(890	)	$	(26	)