Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Plan Assets and Benefit Obligations of Defined Benefit Pension Plans

The plan assets and benefit obligations of the defined benefit pension plans are measured at December 31 of each year.

	U.S. Plans									Non-U.S. Plans
(DOLLARS IN THOUSANDS)	2016			2015			2014			2016			2015			2014
Components of net periodic benefit cost
Service cost for benefits earned	$	2,497		$	3,144		$	3,057		$	15,210		$	15,866		$	14,142
Interest cost on projected benefit obligation	24,096			23,705			25,090			24,413			25,389			33,360
Expected return on plan assets	(33,988		)	(32,405		)	(27,647		)	(45,865		)	(50,437		)	(49,861		)
Net amortization of deferrals	5,821			21,390			17,656			12,802			12,864			10,584
Settlements and curtailments	—			—			—			—			—			43
Net periodic benefit cost	(1,574		)	15,834			18,156			6,560			3,682			8,268
Defined contribution and other retirement plans	8,404			7,104			7,854			6,304			7,028			6,323
Total expense	$	6,830		$	22,938		$	26,010		$	12,864		$	10,710		$	14,591
Changes in plan assets and benefit obligations recognized in OCI
Net actuarial (gain) loss	$	(4,917	)	$	7,623					$	72,848		$	3,848
Recognized actuarial loss	(5,759		)	(21,207		)				(13,643		)	(13,629		)
Prior service cost	—			—						—			459
Recognized prior service cost	(62		)	(183		)				742			765
Currency translation adjustment	—			—						(43,270		)	(25,230		)
Total recognized in OCI (before tax effects)	$	(10,738	)	$	(13,767	)				$	16,677		$	(33,787	)

Components of Net Periodic Benefit Cost and Changes in Plan Assets and Benefit Obligations Recognized in OCI

	Postretirement Benefits
(DOLLARS IN THOUSANDS)	2016			2015			2014
Components of net periodic benefit cost
Service cost for benefits earned	$	852		$	966		$	1,295
Interest cost on projected benefit obligation	3,326			3,904			4,896
Net amortization and deferrals	(5,088		)	(4,476		)	(4,109		)
(Credit) Expense	$	(910	)	$	394		$	2,082
Changes in plan assets and benefit obligations recognized in OCI
Net actuarial loss (gain)	$	2,868		$	(1,557	)
Recognized actuarial loss	(1,701		)	(1,331		)
Prior service credit	—			(33,902		)
Recognized prior service credit	6,789			5,807
Total recognized in OCI (before tax effects)	$	7,956		$	(30,983	)

Amounts Expected to be Recognized in Net Periodic Cost

The amounts expected to be recognized in net periodic cost in 2017 are:

(DOLLARS IN THOUSANDS)	U.S. Plans		Non-U.S. Plans			Postretirement Benefits
Actuarial loss recognition	$	5,181	$	14,344		$	1,513
Prior service cost (credit) recognition	31		(696		)	(6,334		)

Weighted-Average Actuarial Assumption Used to Determine Expense

Weighted-average actuarial assumption used to determine expense	U.S. Plans						Non-U.S. Plans
	2016		2015		2014		2016		2015		2014
Discount rate	4.20	%	3.90	%	4.70	%	3.03	%	2.74	%	4.18	%
Expected return on plan assets	7.30	%	7.30	%	7.30	%	6.40	%	6.24	%	6.27	%
Rate of compensation increase	3.25	%	3.25	%	3.25	%	1.98	%	2.00	%	2.66	%

Changes in Postretirement Benefit Obligation and Plan Assets

Changes in the postretirement benefit obligation and plan assets, as applicable, are detailed in the following table:

	U.S. Plans						Non-U.S. Plans						Postretirement Benefits
(DOLLARS IN THOUSANDS)	2016			2015			2016			2015			2016			2015
Benefit obligation at beginning of year	$	587,511		$	625,479		$	860,240		$	965,266		$	77,148		$	113,497
Service cost for benefits earned	2,497			3,144			15,210			15,866			852			966
Interest cost on projected benefit obligation	24,096			23,705			24,413			25,389			3,326			3,904
Actuarial (gain) loss	(7,078		)	(36,338		)	134,377			(47,883		)	2,868			(1,557		)
Plan amendments	—			—			—			459			—			(33,902		)
Adjustments for expense/tax contained in service cost	—			—			(1,515		)	(1,976		)	—			—
Plan participants’ contributions	—			—			1,538			1,790			411			809
Benefits paid	(29,694		)	(28,479		)	(30,648		)	(29,121		)	(4,760		)	(6,569		)
Curtailments / settlements	—			—			(487		)	—			—			—
Translation adjustments	—			—			(107,562		)	(69,550		)	—			—
Benefit obligation at end of year	$	577,332		$	587,511		$	895,566		$	860,240		$	79,845		$	77,148
Fair value of plan assets at beginning of year	$	500,311		$	501,801		$	790,614		$	852,893
Actual return on plan assets	31,828			(11,556		)	105,879			(3,271		)
Employer contributions	23,519			38,545			23,239			29,352
Participants’ contributions	—			—			1,538			1,790
Benefits paid	(29,694		)	(28,479		)	(30,648		)	(29,121		)
Settlements	—			—			(487		)	—
Translation adjustments	—			—			(97,997		)	(61,029		)
Fair value of plan assets at end of year	$	525,964		$	500,311		$	792,138		$	790,614
Funded status at end of year	$	(51,368	)	$	(87,200	)	$	(103,428	)	$	(69,626	)

Amounts Recognized in Balance Sheet

	U.S. Plans						Non-U.S. Plans
(DOLLARS IN THOUSANDS)	2016			2015			2016			2015
Amounts recognized in the balance sheet:
Other assets	$	4,343		$	—		$	—		$	4,096
Other current liabilities	(4,027		)	(3,866		)	(557		)	(613		)
Retirement liabilities	(51,684		)	(83,334		)	(102,871		)	(73,109		)
Net amount recognized	$	(51,368	)	$	(87,200	)	$	(103,428	)	$	(69,626	)

Amounts Recognized in Accumulated Other Comprehensive Income

	U.S. Plans				Non-U.S. Plans						Postretirement Benefits
(DOLLARS IN THOUSANDS)	2016		2015		2016			2015			2016			2015
Amounts recognized in AOCI consist of:
Net actuarial loss	$	154,417	$	165,093	$	339,654		$	324,068		$	19,336		$	18,169
Prior service cost (credit)	141		203		(7,390		)	(8,482		)	(31,664		)	(38,453		)
Total AOCI (before tax effects)	$	154,558	$	165,296	$	332,264		$	315,586		$	(12,328	)	$	(20,284	)

Accumulated Benefit Obligation

	U.S. Plans						Non-U.S. Plans
(DOLLARS IN THOUSANDS)	2016			2015			2016			2015
Accumulated Benefit Obligation — end of year	$	574,612		$	583,346		$	865,585		$	837,272
Information for Pension Plans with an ABO in excess of Plan Assets:
Projected benefit obligation	$	65,101		$	587,511		$	895,566		$	609,922
Accumulated benefit obligation	65,101			583,346			865,585			586,954
Fair value of plan assets	9,389			500,311			790,218			536,200
Weighted-average assumptions used to determine obligations at December 31
Discount rate	4.20		%	3.90		%	2.14		%	3.03		%
Rate of compensation increase	3.25		%	3.25		%	1.97		%	1.98		%

Estimated Future Benefit Payments

(DOLLARS IN THOUSANDS)	U.S. Plans		Non-U.S. Plans		Postretirement Benefits
Estimated Future Benefit Payments
2017	$	32,871	$	22,781	$	5,005
2018	33,912		23,109		5,132
2019	35,331		23,731		5,227
2020	39,392		23,855		5,431
2021	37,014		24,488		5,417
2022 - 2026	187,696		134,742		25,968
Contributions
Required Company Contributions in the Following Year (2017)	$	16,107	$	13,762	$	5,005

Percentage of Assets Invested

	U.S. Plans				Non-U.S. Plans
	2016		2015		2016		2015
Percentage of assets invested in:
Cash and cash equivalents	—	%	1	%	2	%	2	%
Equities	36	%	41	%	27	%	27	%
Fixed income	64	%	58	%	56	%	55	%
Property	—	%	—	%	5	%	7	%
Alternative and other investments	—	%	—	%	10	%	9	%

Fair Value Hierarchy of Plan Assets

The following tables present the Company's plan assets for the U.S. and non-U.S. plans using the fair value hierarchy as of December 31, 2016 and 2015. The plans’ assets were accounted for at fair value and are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company's assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of fair value assets and their placement within the fair value hierarchy levels. For more information on a description of the fair value hierarchy, see Note 15.

	U.S. Plans for the year ended
	December 31, 2016
(DOLLARS IN THOUSANDS)	Level 1		Level 2		Level 3		Total
Cash Equivalents	$	—	$	1,673	$	—	$	1,673
Fixed Income Securities
Government & Government Agency Bonds	—		11,845		—		11,845
Corporate Bonds	—		90,843		—		90,843
Municipal Bonds	—		9,682		—		9,682
Asset Backed Securities	—		64		—		64
Assets measured at net asset value(1)	—		—		—		410,533
Total	$	—	$	114,107	$	—	$	524,640
Receivables							$	1,324
Total							$	525,964

	U.S. Plans for the year ended
	December 31, 2015
(DOLLARS IN THOUSANDS)	Level 1		Level 2		Level 3		Total
Cash Equivalents	$	—	$	4,767	$	—	$	4,767
Equity Securities
U.S. Common Stock	37,024		—		—		37,024
Balanced Funds	—		8,845		—		8,845
Fixed Income Securities
Government & Government Agency Bonds	—		11,070		—		11,070
Corporate Bonds	—		77,754		—		77,754
Municipal Bonds	—		10,006		—		10,006
Assets measured at net asset value(1)	—		—		—		350,074
Total	$	37,024	$	112,442	$	—	$	499,540
Receivables							$	771
Total							$	500,311

⁽¹⁾ Investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table above are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheet. The total amount measured at net asset value includes approximately $187.3 million and $159.7 million in pooled equity funds and $223.2 million and $190.3 million in fixed income mutual funds for the years ended December 31, 2016 and 2015, respectively.

	Non-U.S. Plans for the year ended
	December 31, 2016
(DOLLARS IN THOUSANDS)	Level 1		Level 2		Level 3		Total
Cash	$	12,726	$	—	$	—	$	12,726
Equity Securities
U.S. Large Cap	72,438		17,102		—		89,540
U.S. Mid Cap	504		—		—		504
U.S. Small Cap	382		—		—		382
Non-U.S. Large Cap	69,442		10,606		—		80,048
Non-U.S. Mid Cap	514		—		—		514
Non-U.S. Small Cap	284		—		—		284
Emerging Markets	37,354		1,035		—		38,389
Fixed Income Securities
U.S. Treasuries/Government Bonds	75		—		—		75
U.S. Corporate Bonds	—		28,843		—		28,843
Non-U.S. Treasuries/Government Bonds	121,987		57,116		—		179,103
Non-U.S. Corporate Bonds	26,412		183,020		—		209,432
Non-U.S. Asset-Backed Securities	—		27,114		—		27,114
Non-U.S. Other Fixed Income	1,969		—		—		1,969
Alternative Types of Investments
Insurance Contracts	—		31,087		246		31,333
Hedge Funds	—		—		30,739		30,739
Other	—		16,904		—		16,904
Absolute Return Funds	2,443		—		—		2,443
Non-U.S. Real Estate	—		—		41,796		41,796
Total	$	346,530	$	372,827	$	72,781	$	792,138

	Non-U.S. Plans for the year ended
	December 31, 2015
(DOLLARS IN THOUSANDS)	Level 1		Level 2		Level 3		Total
Cash	$	13,239	$	—	$	—	$	13,239
Equity Securities
U.S. Large Cap	74,306		17,118		—		91,424
U.S. Mid Cap	262		—		—		262
U.S. Small Cap	230		—		—		230
Non-U.S. Large Cap	73,578		12,372		—		85,950
Non-U.S. Mid Cap	2,175		—		—		2,175
Non-U.S. Small Cap	226		—		—		226
Emerging Markets	33,291		2,152		—		35,443
Fixed Income Securities
U.S. Treasuries/Government Bonds	67		—		—		67
Non-U.S. Treasuries/Government Bonds	121,552		55,184		—		176,736
Non-U.S. Corporate Bonds	56,238		174,626		—		230,864
Non-U.S. Asset-Backed Securities	—		26,132		—		26,132
Non-U.S. Other Fixed Income	1,625		—		—		1,625
Alternative Types of Investments
Insurance Contracts	299		36,447		—		36,746
Hedge Funds	—		—		17,034		17,034
Absolute Return Funds	2,566		16,603		—		19,169
Non-U.S. Real Estate	—		13,985		39,307		53,292
Total	$	379,654	$	354,619	$	56,341	$	790,614

Reconciliation of Level 3 Non-U.S. Plan Assets Held

The following table presents a reconciliation of Level 3 non-U.S. plan assets held during the year ended December 31, 2016:

	Non-U.S. Plans
(DOLLARS IN THOUSANDS)	Real Estate			Hedge Funds			Total
Ending balance as of December 31, 2015	$	39,307		$	17,034		$	56,341
Actual return on plan assets	(8,525		)	(1,333		)	(9,858		)
Purchases, sales and settlements	(528		)	15,038			14,510
Transfers in/out	11,788			—			11,788
Ending balance as of December 31, 2016	$	42,042		$	30,739		$	72,781

Weighted Average Assumptions Used to Determine Postretirement Benefit Expense and Obligation

The following weighted average assumptions were used to determine the postretirement benefit expense and obligation for the years ended December 31:

	Expense				Liability
	2016		2015		2016		2015
Discount rate	4.20	%	3.90	%	4.20	%	4.20	%
Current medical cost trend rate	7.15	%	5.80	%	8.00	%	7.15	%
Ultimate medical cost trend rate	4.75	%	4.75	%	4.75	%	4.75	%
Medical cost trend rate decreases to ultimate rate in year	2023		2023		2030		2023

Sensitivity of Disclosures to Changes in Selected Assumptions

	Sensitivity of Disclosures to Changes in Selected Assumptions
	25 BP Decrease in Discount Rate				25 BP Decrease in Discount Rate			25 BP Decrease in Long-Term Rate of Return
(DOLLARS IN THOUSANDS)	Change in PBO		Change in ABO		Change in pension expense			Change in pension expense
U.S. Pension Plans	$	15,719	$	15,620	$	(109	)	$	1,250
Non-U.S. Pension Plans	46,658		44,861		2,876			1,895
Postretirement Benefit Plan	N/A		2,302		100			N/A