Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2017

Retirement Benefits [Abstract]

Components of net periodic benefit cost

The components of net periodic benefit costs related to pension benefits are as follows: 

	Three Months Ended September 30,												Nine Months Ended September 30,
	2017						2016						2017						2016
	U.S Plans			Non-U.S. Plans			U.S Plans			Non-U.S. Plans			U.S Plans			Non-U.S. Plans			U.S Plans			Non-U.S. Plans
	(In thousands)
Service cost	$	799		$	695		$	771		$	566		$	2,399		$	1,998		$	2,518		$	1,642
Interest cost	1,832			718			1,828			632			5,494			2,093			5,514			2,264
Expected return on plan assets	(2,351		)	(811		)	(2,344		)	(698		)	(7,052		)	(2,371		)	(7,011		)	(2,593		)
Amortization of prior service cost	905			55			648			5			2,715			160			2,048			17
Net periodic benefit cost	$	1,185		$	657		$	903		$	505		$	3,556		$	1,880		$	3,069		$	1,330

The components of net periodic benefit cost related to other post-retirement benefits are as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
	U.S Plans		U.S Plans		U.S Plans		U.S Plans
	(In thousands)
Service cost	$	130	$	135	$	420	$	405
Interest cost	348		350		1,028		1,050
Amortization of prior service cost	150		153		450		458
Net periodic benefit cost	$	628	$	638	$	1,898	$	1,913