Defined Benefit Pension Plans Defined Benefit Pension Plans (Tables)

12 Months Ended

Dec. 31, 2017

Defined Benefit Plan [Abstract]

Schedule of Changes in Benefit Obligation and Fair Value of Plan Assets [Table Text Block]

The following tables set forth the components of the changes in benefit obligations and fair value of plan assets:

	Year Ended December 31,
	2017			2016
	(in thousands)
Change in benefit obligation:
Benefit obligation at January 1,	$	97,261		$	98,767
Service cost	3,968			3,472
Interest cost	2,264			2,573
Actuarial (gain) loss	(2,351		)	7,733
Benefits paid	(3,136		)	(9,481		)
Foreign currency exchange rate changes	13,014			(4,386		)
Curtailment	(858		)	14
Settlement	(175		)	(1,431		)
Other	833			—
Benefit obligation at December 31,	$	110,820		$	97,261
Change in plan assets:
Fair value of plan assets at January 1,	$	10,215		$	9,662
Actual return on plan assets	786			604
Company contributions	399			348
Benefits paid	(383		)	(370		)
Foreign currency exchange rate changes	984			(29		)
Other	833			—
Fair value of plan assets at December 31,	12,834			10,215
Net pension benefit obligation at fair value	$	97,986		$	87,046

Schedule of Amounts Recognized in the Consolidated Balance Sheets [Table Text Block]

Amounts recognized on the Consolidated Balance Sheets consist of:

	At December 31,
	2017		2016
	(in thousands)
Assets
Plan assets in other long-term assets	$	991	$	654
Liabilities
Current portion of pension benefit obligation in wages and benefits payable	3,260		3,202
Long-term portion of pension benefit obligation	95,717		84,498
Pension benefit obligation, net	$	97,986	$	87,046

Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]

Amounts in AOCI (pre-tax) that have not yet been recognized as components of net periodic benefit costs consist of:

	At December 31,
	2017		2016
	(in thousands)
Net actuarial loss	$	25,379	$	26,767
Net prior service cost	641		619
Amount included in AOCI	$	26,020	$	27,386

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

Amounts recognized in OCI (pre-tax) are as follows:

	Year Ended December 31,
	2017			2016			2015
	(in thousands)
Net actuarial (gain) loss	$	(3,209	)	$	6,316		$	(6,894	)
Settlement (gain) loss	2			(1,343		)	(336		)
Curtailment (gain) loss	586			—			—
Plan asset (gain) loss	(192		)	(64		)	343
Amortization of net actuarial loss	(2,308		)	(1,351		)	(1,979		)
Amortization of prior service cost	(62		)	(58		)	(59		)
Other	—			4			(46		)
Other comprehensive (income) loss	$	(5,183	)	$	3,504		$	(8,971	)

Schedule of Net Periodic Pension Benefit Costs [Table Text Block]

Net periodic pension benefit costs for our plans include the following components:

	Year Ended December 31,
	2017			2016			2015
	(in thousands)
Service cost	$	3,968		$	3,472		$	4,572
Interest cost	2,264			2,573			2,380
Expected return on plan assets	(594		)	(540		)	(502		)
Amortization of prior service costs	62			58			59
Amortization of actuarial net loss	2,308			1,351			1,979
Settlement	(2		)	1,343			375
Curtailment	(586		)	—			46
Other	—			(3		)	(1		)
Net periodic pension benefit costs	$	7,420		$	8,254		$	8,908

Schedule of Assumptions Used [Table Text Block]

The significant actuarial weighted average assumptions used in determining the benefit obligations and net periodic benefit cost for our benefit plans are as follows:

	At and For The Year Ended December 31,
	2017		2016		2015
Actuarial assumptions used to determine benefit obligations at end of period:
Discount rate	2.21	%	2.18	%	2.59	%
Expected annual rate of compensation increase	3.64	%	3.65	%	3.60	%
Actuarial assumptions used to determine net periodic benefit cost for the period:
Discount rate	2.18	%	2.59	%	2.36	%
Expected rate of return on plan assets	5.58	%	5.29	%	5.45	%
Expected annual rate of compensation increase	3.65	%	3.60	%	3.37	%

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

The total obligations and fair value of plan assets for plans with projected benefit obligations and accumulated benefit obligations exceeding the fair value of plan assets are as follows:

	At December 31,
	2017		2016
	(in thousands)
Projected benefit obligation	$	106,486	$	94,110
Accumulated benefit obligation	97,546		84,448
Fair value of plan assets	7,509		6,410

Fair values of the assets held by the postretirement benefits plans by asset category [Table Text Block]

The fair values of our plan investments by asset category are as follows:

	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Unobservable Inputs (Level 3)
	(in thousands)
	December 31, 2017
Cash	$	789	$	789	$	—
Insurance funds	8,384		—		8,384
Other securities	3,661		—		3,661
Total fair value of plan assets	$	12,834	$	789	$	12,045
	December 31, 2016
Cash	$	783	$	783	$	—
Insurance funds	7,011		—		7,011
Other securities	2,421		—		2,421
Total fair value of plan assets	$	10,215	$	783	$	9,432

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

The following tables present a reconciliation of Level 3 assets held during the years ended December 31, 2017 and 2016.

	Balance at January 1, 2017		Net Realized and Unrealized Gains		Net Purchases, Issuances, Settlements, and Other			Net Transfers Into Level 3		Effect of Foreign Currency			Balance at December 31, 2017
	(in thousands)
Insurance funds	$	7,011	$	257	$	102		$	—	$	1,014		$	8,384
Other securities	2,421		523		(93		)	833		(23		)	3,661
Total	$	9,432	$	780	$	9		$	833	$	991		$	12,045

	Balance at January 1, 2016		Net Realized and Unrealized Gains		Net Purchases, Issuances, Settlements, and Other			Net Transfers Into Level 3		Effect of Foreign Currency			Balance at December 31, 2016
	(in thousands)
Insurance funds	$	7,089	$	235	$	54		$	—	$	(367	)	$	7,011
Other securities	1,778		405		(84		)	—		322			2,421
Total	$	8,867	$	640	$	(30	)	$	—	$	(45	)	$	9,432

Schedule of Expected Benefit Payments [Table Text Block]

Annual benefit payments for the next 10 years, including amounts to be paid from our assets for unfunded plans and reflecting expected future service, as appropriate, are expected to be paid as follows:

Year Ending December 31,	Estimated Annual Benefit Payments
	(in thousands)
2018	$	3,801
2019	3,124
2020	3,744
2021	4,329
2022	4,511
2023-2027	28,121