Pension (Projected Benefit Obligation and Fair Value of Assets) (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Change in projected benefit obligation:
Projected benefit obligation, beginning of year	$ 386,020	$ 364,809
Service cost	5,151	5,001
Interest cost	15,599	16,536
Exchange rate fluctuations	138	1,214
Actuarial (gain) loss	(31,537)	24,400
Settlements paid	0	(281)
Benefits paid	(22,799)	(25,659)
Projected benefit obligation, end of year	352,572	386,020
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	343,219	318,414
Actual return on plan assets	(19,533)	47,595
Employer contributions	3,197	3,150
Settlements paid	0	(281)
Benefits paid	(22,799)	(25,659)
Fair value of plan assets, end of year	$ 304,084	$ 343,219
Funded status of plan:
Funded ratio	86.20%	88.90%
Funded status and net accrued pension benefit cost	$ (48,488)	$ (42,801)
U.S. Plans
Change in projected benefit obligation:
Projected benefit obligation, beginning of year	354,053	336,648
Service cost	4,009	3,916
Interest cost	12,615	13,787
Exchange rate fluctuations	0	0
Actuarial (gain) loss	(28,481)	22,991
Settlements paid	0	(281)
Benefits paid	(19,602)	(23,008)
Projected benefit obligation, end of year	322,594	354,053
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	343,219	318,414
Actual return on plan assets	(19,533)	47,595
Employer contributions	0	499
Settlements paid	0	(281)
Benefits paid	(19,602)	(23,008)
Fair value of plan assets, end of year	$ 304,084	$ 343,219
Funded status of plan:
Funded ratio	94.30%	96.90%
Funded status and net accrued pension benefit cost	$ (18,510)	$ (10,834)
Non-U.S. Plans
Change in projected benefit obligation:
Projected benefit obligation, beginning of year	31,967	28,161
Service cost	1,142	1,085
Interest cost	2,984	2,749
Exchange rate fluctuations	138	1,214
Actuarial (gain) loss	(3,056)	1,409
Settlements paid	0	0
Benefits paid	(3,197)	(2,651)
Projected benefit obligation, end of year	29,978	31,967
Change in fair value of plan assets:
Fair value of plan assets, beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	3,197	2,651
Settlements paid	0	0
Benefits paid	(3,197)	(2,651)
Fair value of plan assets, end of year	$ 0	$ 0
Funded status of plan:
Funded ratio	0.00%	0.00%
Funded status and net accrued pension benefit cost	$ (29,978)	$ (31,967)

Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

Name:	us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.