Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2017

Defined benefit pension plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended September 30,												Nine Months Ended September 30,
	U.S. Plan						Non-U.S. Plans						U.S. Plan						Non-U.S. Plans
	2017			2016			2017			2016			2017			2016			2017			2016
Service cost	$	3,021		$	3,478		$	1,399		$	1,389		$	9,063		$	10,435		$	4,059		$	4,167
Interest cost	5,429			5,762			1,332			1,334			16,288			17,285			3,881			4,103
Expected return on plan assets	(9,953		)	(9,698		)	(1,885		)	(1,899		)	(29,859		)	(29,095		)	(5,522		)	(5,821		)
Amortization:
Prior service cost (credit)	107			184			(115		)	(100		)	320			550			(337		)	(299		)
Recognized actuarial loss	1,396			1,610			894			670			4,187			4,828			2,599			2,010
Transition obligation	—			—			1			1			—			—			3			3
Net periodic expense	$	—		$	1,336		$	1,626		$	1,395		$	(1	)	$	4,003		$	4,683		$	4,163

Supplemental Employee Retirement Plans, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Service cost	$	619		$	740		$	1,855		$	2,219
Interest cost	1,019			1,317			3,057			3,951
Amortization:
Prior service cost	1,103			1,567			3,308			4,700
Recognized actuarial gain	(298		)	(141		)	(894		)	(421		)
Net periodic expense	$	2,443		$	3,483		$	7,326		$	10,449

Post-Retirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
Service cost	$	8		$	13		$	25		$	39
Interest cost	74			105			220			314
Amortization:
Prior service cost (credit)	2			(35		)	6			(107		)
Recognized actuarial gain	(41		)	(58		)	(121		)	(177		)
Net periodic expense	$	43		$	25		$	130		$	69