Pension and Other Post Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2017

Pension and Other Postretirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

																Other Post-
				Pension Benefits												Retirement Benefits
				2017							2016					2017		2016
Change in benefit obligation				Foreign		Domestic		Total		Foreign		Domestic		Total		Domestic		Domestic
Gross benefit obligation at beginning
	of year			$	103,491	$	67,254	$	170,745	$	92,406	$	66,862	$	159,268	$	4,730	$	5,422
Service cost					3,219		337		3,556		2,378		298		2,676		8		10
Interest cost					2,066		1,932		3,998		2,314		2,114		4,428		144		142
Employee contributions					68		—		68		71		—		71		—		—
Plan settlements					—		(4,341)		(4,341)		—		—		—		—		—
Benefits paid					(2,503)		(4,031)		(6,534)		(1,583)		(4,522)		(6,105)		(448)		(443)
Plan expenses and premiums paid					(210)		—		(210)		(155)		(275)		(430)		—		—
Actuarial (gain) loss					(1,164)		1,826		662		14,848		2,777		17,625		295		(401)
Translation differences and other					13,385		—		13,385		(6,788)		—		(6,788)		—		—
Gross benefit obligation at end of year				$	118,352	$	62,977	$	181,329	$	103,491	$	67,254	$	170,745	$	4,729	$	4,730
Change in plan assets
Fair value of plan assets at
year	beginning of year			$	86,844	$	49,197	$	136,041	$	76,156	$	46,701	$	122,857	$	—	$	—
Actual return on plan assets					116		6,865		6,981		14,472		2,516		16,988		—		—
Employer contributions					2,867		4,574		7,441		3,103		4,777		7,880		448		443
Employee contributions					68		—		68		71		—		71		—		—
Plan settlements					—		(4,341)		(4,341)		—		—		—		—		—
Benefits paid					(2,503)		(4,031)		(6,534)		(1,583)		(4,522)		(6,105)		(448)		(443)
Plan expenses and premiums paid					(210)		(300)		(510)		(155)		(275)		(430)		—		—
Translation differences					11,440		—		11,440		(5,220)		—		(5,220)		—		—
Fair value of plan assets at end of year				$	98,622	$	51,964	$	150,586	$	86,844	$	49,197	$	136,041	$	—	$	—
Net benefit obligation recognized				$	(19,730)	$	(11,013)	$	(30,743)	$	(16,647)	$	(18,057)	$	(34,704)	$	(4,729)	$	(4,730)
Amounts recognized in the balance
	sheet consist of:
		Non-current assets		$	—	$	1,184	$	1,184	$	—	$	—	$	—	$	—	$	—
		Current liabilities			(89)		(560)		(649)		(61)		(574)		(635)		(459)		(451)
		Non-current liabilities			(19,641)		(11,637)		(31,278)		(16,586)		(17,483)		(34,069)		(4,270)		(4,279)
Net benefit obligation recognized				$	(19,730)	$	(11,013)	$	(30,743)	$	(16,647)	$	(18,057)	$	(34,704)	$	(4,729)	$	(4,730)
Amounts not yet reflected in net
	periodic benefit costs and included in
	accumulated other comprehensive loss:
		Prior service credit (cost)		$	1,744	$	(59)	$	1,685	$	1,687	$	(122)	$	1,565	$	—	$	—
		Accumulated loss			(22,598)		(27,133)		(49,731)		(20,214)		(33,147)		(53,361)		(823)		(581)
		AOCI			(20,854)		(27,192)		(48,046)		(18,527)		(33,269)		(51,796)		(823)		(581)
		Cumulative employer contributions
			in excess of or (below) net periodic
			benefit cost		1,124		16,179		17,303		1,880		15,212		17,092		(3,906)		(4,149)
Net benefit obligation recognized				$	(19,730)	$	(11,013)	$	(30,743)	$	(16,647)	$	(18,057)	$	(34,704)	$	(4,729)	$	(4,730)

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

	2017							2016
	Foreign		Domestic		Total		Foreign		Domestic		Total
Projected benefit obligation	$	118,352	$	12,197	$	130,549	$	103,491	$	67,254	$	170,745
Accumulated benefit obligation		114,069		11,456		125,525		100,463		66,676		167,139
Fair value of plan assets		98,622		—		98,622		86,844		49,197		136,041

Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

	2017							2016
	Foreign		Domestic		Total		Foreign		Domestic		Total
Projected benefit obligation	$	118,352	$	12,197	$	130,549	$	103,491	$	67,254	$	170,745
Fair value of plan assets		98,622		—		98,622		86,844		49,197		136,041

Schedule of Net Benefit Costs [Table Text Block]

	2017							2016
	Foreign		Domestic		Total		Foreign		Domestic		Total
Service cost	$	3,219	$	337	$	3,556	$	2,378	$	298	$	2,676
Interest cost		2,066		1,932		3,998		2,314		2,114		4,428
Expected return on plan assets		(1,994)		(3,067)		(5,061)		(2,026)		(3,316)		(5,342)
Settlement loss		—		1,946		1,946		—		—		—
Actuarial loss amortization		862		2,396		3,258		839		2,336		3,175
Prior service (credit) cost
amortization		(167)		63		(104)		(164)		63		(101)
Net periodic benefit cost	$	3,986	$	3,607	$	7,593	$	3,341	$	1,495	$	4,836

		2015
	Foreign		Domestic		Total
Service cost	$	2,799	$	250	$	3,049
Interest cost		2,476		2,541		5,017
Expected return on plan assets		(2,092)		(3,453)		(5,545)
Settlement loss		170		—		170
Actuarial loss amortization		1,136		2,353		3,489
Prior service (credit) cost amortization		(164)		63		(101)
Net periodic benefit cost	$	4,325	$	1,754	$	6,079

		2017		2016		2015
Service cost	$	8	$	10	$	17
Interest cost		144		142		195
Actuarial loss amortization		54		—		83
Net periodic benefit costs	$	206	$	152	$	295

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

			2017							2016
			Foreign		Domestic		Total		Foreign		Domestic		Total
Net loss (gain) arising during
	the period		$	715	$	(1,672)	$	(957)	$	2,401	$	3,576	$	5,977
Recognition of amortization in net
	periodic benefit cost
		Prior service credit (cost)		167		(63)		104		164		(63)		101
		Actuarial loss		(862)		(4,342)		(5,204)		(839)		(2,336)		(3,175)
Effect of exchange rates on amounts
		included in AOCI		2,308		—		2,308		(1,347)		—		(1,347)
Total recognized in other
		comprehensive loss (income)		2,328		(6,077)		(3,749)		379		1,177		1,556
Total recognized in net periodic
	benefit cost and other
	comprehensive loss (income)		$	6,314	$	(2,470)	$	3,844	$	3,720	$	2,672	$	6,392

			2015
				Foreign		Domestic		Total
Net (gain) loss arising during period			$	(3,537)	$	1,134	$	(2,403)
Recognition of amortization in net periodic benefit
		Prior service credit (cost)		164		(63)		101
		Actuarial loss		(1,306)		(2,353)		(3,659)
Effect of exchange rates on amounts included
	in AOCI			(2,353)		—		(2,353)
Total recognized in other comprehensive income				(7,032)		(1,282)		(8,314)
Total recognized in net periodic benefit cost and
	other comprehensive (income) loss		$	(2,707)	$	472	$	(2,235)

			2017		2016		2015
Net loss (gain) arising during period		$	295	$	(401)	$	(302)
Amortization of actuarial loss in net periodic
	benefit costs		(54)		—		(83)
Total recognized in other comprehensive loss
	(income)		241		(401)		(385)
Total recognized in net periodic benefit cost and
	other comprehensive loss (income)	$	447	$	(249)	$	(90)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

							Other Post-
	Pension Plans						Retirement
	Foreign		Domestic		Total		Benefits
Actuarial loss	$	890	$	2,283	$	3,173	$	58
Prior service (credit) cost		(177)		59		(118)		—
	$	713	$	2,342	$	3,055	$	58

Schedule of Assumptions Used [Table Text Block]

					Other Postretirement
	Pension Benefits				Benefits
	2017		2016		2017		2016
U.S. Plans:
Discount rate	3.44	%	3.88	%	3.39	%	3.73	%
Rate of compensation increase	3.63	%	3.63	%	N/A		N/A
Foreign Plans:
Discount rate	2.31	%	2.17	%	N/A		N/A
Rate of compensation increase	2.89	%	2.48	%	N/A		N/A

						Other Postretirement
		Pension Benefits				Benefits
		2017		2016		2017		2016
U.S. Plans:
Discount rate		3.88	%	4.07	%	3.73	%	3.88	%
Expected long-term return on
	plan assets	7.00	%	7.20	%	N/A		N/A
Rate of compensation increase		3.63	%	3.63	%	N/A		N/A
Foreign Plans:
Discount rate		2.17	%	2.95	%	N/A		N/A
Expected long-term return on
	plan assets	2.12	%	2.65	%	N/A		N/A
Rate of compensation increase		2.48	%	2.41	%	N/A		N/A

		2017		2016
Health care cost trend rate for next year		6.40	%	6.70	%
Rate to which the cost trend rate is assumed to decline (the
	ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate		2037		2037

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

		1% Point		1% Point
		Increase		Decrease
Effect on total service and interest cost	$	16	$	(14)
Effect on postretirement benefit obligations		356		(311)

Schedule of Allocation of Plan Assets [Table Text Block]

Asset Category		Target		2017		2016
U.S. Plans
Equity securities		56	%	59	%	60	%
Debt securities		43	%	40	%	39	%
Other		1	%	1	%	1	%
	Total	100	%	100	%	100	%
Foreign Plans
Equity securities and other		25	%	25	%	24	%
Debt securities		75	%	75	%	76	%
	Total	100	%	100	%	100	%

						Fair Value Measurements at December 31, 2017
				Total			Using Fair Value Hierarchy
U.S. Pension Assets				Fair Value			Level 1		Level 2		Level 3
Cash and cash equivalents				$	449		$	449	$	—	$	—
Small capitalization common stock					1,508			1,508		—		—
	Subtotal U.S. pension plan assets in fair value hierarchy			$	1,957		$	1,957	$	—	$	—
Commingled funds measured at NAV					48,527
Pooled separate accounts measured at NAV					1,480
		Total U.S. pension plan assets		$	51,964
Foreign Pension Assets
Cash and cash equivalents				$	26		$	26	$	—	$	—
Insurance contract					82,092			—		—		82,092
Diversified equity securities - registered investment companies					9,002			—		9,002		—
Fixed income - foreign registered investment companies					2,951			—		2,951		—
Real estate - registered investment companies					2,428			—		—		2,428
	Sub-total of foreign pension assets in fair value hierarchy			$	96,499		$	26	$	11,953	$	84,520
Commingled funds measured at NAV					2,123
		Total foreign pension assets		$	98,622
			Total pension assets in fair value hierarchy	$	98,456		$	1,983	$	11,953	$	84,520
			Total pension assets measured at NAV		52,130
			Total pension assets	$	150,586

						Fair Value Measurements at December 31, 2016
				Total			Using Fair Value Hierarchy
U.S. Pension Assets				Fair Value			Level 1		Level 2		Level 3
Cash and cash equivalents				$	302		$	302	$	—	$	—
Small capitalization common stock					1,279			1,279		—		—
	Subtotal U.S. pension plan assets in fair value hierarchy			$	1,581		$	1,581	$	—	$	—
Commingled funds measured at NAV					46,185
Pooled separate accounts measured at NAV					1,431
		Total U.S. pension plan assets		$	49,197
Foreign Pension Assets
Cash and cash equivalents				$	130		$	130	$	—	$	—
Insurance contract					72,778			—		—		72,778
Diversified equity securities - registered investment companies					7,308			—		7,308		—
Fixed income - foreign registered investment companies					2,753			—		2,753		—
Real estate - registered investment companies					2,041			—		—		2,041
	Subtotal foreign pension assets in fair value hierarchy			$	85,010		$	130	$	10,061	$	74,819
Commingled funds measured at NAV					1,834
		Total foreign pension plan assets		$	86,844
			Total pension assets in fair value hierarchy	$	86,591		$	1,711	$	10,061	$	74,819
			Total pension assets measured at NAV		49,450
			Total pension assets	$	136,041

Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]

			Insurance		Real Estate
			Contract		Fund		Total
Balance as of December 31, 2015		$	62,409	$	2,388	$	64,797
	Purchases		2,584		—		2,584
	Settlements		(1,350)		—		(1,350)
	Unrealized gains		12,005		56		12,061
	Currency translation adjustment		(2,870)		(403)		(3,273)
Balance as of December 31, 2016			72,778		2,041		74,819
	Purchases		2,350		—		2,350
	Settlements		(1,661)		—		(1,661)
	Unrealized (losses) gains		(1,425)		188		(1,237)
	Currency translation adjustment		10,050		199		10,249
Balance as of December 31, 2017		$	82,092	$	2,428	$	84,520

Schedule of Expected Benefit Payments [Table Text Block]

							Other Post-
	Pension Benefits						Retirement
	Foreign		Domestic		Total		Benefits
2018	$	2,205	$	4,473	$	6,678	$	459
2019		2,384		4,420		6,804		441
2020		2,623		4,187		6,810		416
2021		3,322		4,159		7,481		489
2022		3,346		4,165		7,511		364
2023 to 2027		19,491		22,218		41,709		1,502