Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2017

Defined benefit pension plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended June 30,												Six Months Ended June 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		$	3,479		$	1,343		$	1,405		$	6,042		$	6,957		$	2,660		$	2,778
Interest cost	5,430			5,761			1,285			1,394			10,859			11,523			2,549			2,769
Expected return on plan assets	(9,953		)	(9,699		)	(1,833		)	(1,974		)	(19,906		)	(19,397		)	(3,637		)	(3,922		)
Amortization:
Prior service cost (credit)	106			183			(112		)	(100		)	213			366			(222		)	(199		)
Recognized actuarial loss	1,395			1,610			864			675			2,791			3,219			1,705			1,340
Transition obligation	—			—			1			1			—			—			2			2
Net periodic expense	$	(1	)	$	1,334		$	1,548		$	1,401		$	(1	)	$	2,668		$	3,057		$	2,768

Supplemental Employee Retirement Plans, Defined Benefit [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Service cost	$	618		$	739		$	1,236		$	1,479
Interest cost	1,019			1,317			2,038			2,634
Amortization:
Prior service cost	1,103			1,566			2,205			3,133
Recognized actuarial gain	(298		)	(140		)	(596		)	(280		)
Net periodic expense	$	2,442		$	3,482		$	4,883		$	6,966

Post-Retirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Defined Benefit Plans Disclosures

	Three Months Ended June 30,						Six Months Ended June 30,
	2017			2016			2017			2016
Service cost	$	9		$	13		$	17		$	26
Interest cost	73			104			146			209
Amortization:
Prior service cost (credit)	2			(35		)	4			(71		)
Recognized actuarial gain	(40		)	(59		)	(80		)	(118		)
Net periodic expense	$	44		$	23		$	87		$	46