Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Defined benefit pension plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended March 31,
	U.S. Plan						Non-U.S. Plans
	2018			2017			2018			2017
Service cost	$	2,984		$	3,021		$	1,577		$	1,317
Interest cost	5,102			5,429			1,378			1,264
Expected return on plan assets	(10,211		)	(9,953		)	(2,091		)	(1,804		)
Amortization:
Prior service cost (credit)	87			107			(115		)	(110		)
Recognized actuarial loss	1,931			1,396			803			841
Transition obligation	—			—			1			1
Net periodic (income)/expense	$	(107	)	$	—		$	1,553		$	1,509

Supplemental Employee Retirement Plans, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended March 31,
	2018			2017
Service cost	$	695		$	618
Interest cost	893			1,019
Amortization:
Prior service cost	963			1,102
Recognized actuarial gain	(255		)	(298		)
Net periodic expense	$	2,296		$	2,441

Post-Retirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended March 31,
	2018			2017
Service cost	$	8		$	8
Interest cost	73			73
Amortization:
Prior service cost	3			2
Recognized actuarial gain	(8		)	(40		)
Net periodic expense	$	76		$	43