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Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Fair Value Of Plan Assets Gross	$ 203,314	$ 177,057
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	21,276	18,597	$ 21,283
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold	6	14
Actual return on plan assets still held	349	319
Sales		(4,971)
Foreign currency translation	1,720	337
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase	1,715	1,615
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlement	1,111
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0	0
Foreign currency translation	0	0
United States | Pension Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	606,896	550,238	488,900
Defined Benefit Plan Fair Value Of Plan Assets Gross	413,468	293,751
Foreign currency translation	0	0
United States | Pension Plan [Member] | Qualified Plan [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	11,650	7,284
Defined Benefit Plan Fair Value Of Plan Assets Gross	11,650	7,284
United States | Pension Plan [Member] | Qualified Plan [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	401,818	286,467
Defined Benefit Plan Fair Value Of Plan Assets Gross	401,818	286,467
United States | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	329,800	216,981
United States | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
United States | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	329,800	216,981
United States | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	80,551	75,332
United States | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	8,533	5,846
United States | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	72,018	69,486
United States | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	3,117	1,438
United States | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	3,117	1,438
United States | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
United States | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	180,103	241,058
United States | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
United States | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
United States | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	13,325	15,429
United States | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
United States | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	212,748	185,590	$ 162,589
Defined Benefit Plan Fair Value Of Plan Assets Gross	133,625	117,223
Foreign currency translation	13,483	3,909
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	85,100	75,236
Defined Benefit Plan Fair Value Of Plan Assets Gross	85,100	75,236
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	27,249	23,390
Defined Benefit Plan Fair Value Of Plan Assets Gross	27,249	23,390
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	21,276	18,597
Defined Benefit Plan Fair Value Of Plan Assets Gross	21,276	18,597
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	74,138	64,000
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	2,822	3,752
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	2,822	3,752
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Common stocks [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	52,865	44,685
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Common stocks [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	52,865	44,685
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Common stocks [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Common stocks [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Fixed income investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	26,068	19,871
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Fixed income investments [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Fixed income investments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	26,068	19,871
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Fixed income investments [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Mutual Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	29,413	26,799
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Mutual Fund [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	29,413	26,799
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Mutual Fund [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Mutual Fund [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Other plan assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	22,457	22,116
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Other plan assets [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Other plan assets [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	1,181	3,519
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Other plan assets [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	21,276	18,597
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Net Asset Value (NAV) Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	4,985	4,367
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Net Asset Value (NAV) Other [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Net Asset Value (NAV) Other [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	0	0
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Net Asset Value (NAV) Other [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	$ 0	$ 0

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- Definition

Fair value of plan assets of the defined benefit plan as of the balance sheet date before deduction of net non-benefit obligations which are considered reductions of plan assets.

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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold.

+ References

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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