Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Aug. 28, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed Pre-65, Next Fiscal Year			6.80%	7.00%
Non-current asset			$ 3,917	$ 1,776
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter			$ 103,857
Employer matching contribution, percent	100.00%		50.00%
Employers matching contribution, annual vesting percentage				20.00%
Employers matching contribution, vesting term (in years)				5 years
Defined benefit plan, cost of employer contribution			$ 3,428	$ 1,847	$ 1,978
Fair value of plan assets			235,297	210,993	$ 247,583
Defined benefit plan, settlement charge				2,400
Defined Benefit Plan, Other Cost (Credit)			$ (3,451)	$ 0
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Pre-65			4.50%	5.00%
Defined Benefit Plan, Health Care Cost Trend Rate Assumed Post-65, Next Fiscal Year			6.80%	7.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Post-65			4.50%	5.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			6.25%	7.00%	7.25%
401K [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution, percent of employees' gross pay	4.00%			5.00%
Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			2.00%	1.97%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate			1.24%	2.00%	1.97%
Pension contributions			$ 800
United States | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			3.93%	3.27%	3.86%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate			2.83%	3.93%	3.27%
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			3.70%	3.53%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase			3.15%	3.11%
Foreign Plan [Member] | Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions			$ 4,300
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter			$ 101,297
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase			3.09%	3.14%	3.11%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Non-current asset			$ 0	$ 0
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter			2,560
Fair value of plan assets			0	0	$ 0
Defined Benefit Plan, Other Cost (Credit)			$ 0	$ 0
Other Postretirement Benefits Plan [Member] | United States
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate			3.05%	4.10%	3.48%
Other Postretirement Benefits Plan [Member] | United States | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			4.10%	3.48%	3.63%
Vesting Year 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Employers matching contribution, annual vesting percentage			0.00%
Employers matching contribution, vesting term (in years)			1 year
Vesting Year 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Employers matching contribution, annual vesting percentage			50.00%
Employers matching contribution, vesting term (in years)			2 years
Vesting Year 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Employers matching contribution, annual vesting percentage			100.00%
Employers matching contribution, vesting term (in years)			3 years
Subsequent Event | United States | Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions		$ 1,100
Subsequent Event | Foreign Plan [Member] | Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions		$ 4,200