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Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Fair Value Of Plan Assets Gross $ 177,057 $ 154,673  
Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 18,597 21,283 $ 4,592
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold 14    
Actual return on plan assets still held 319 (29)  
Sales   16,975  
Foreign currency translation 337 (255)  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase 1,615    
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlement 4,971    
Other plan assets [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   21,283  
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  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0 0
Foreign currency translation 0 0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 0  
United States | Pension Plan [Member] | Qualified Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 550,238 488,900 617,840
Defined Benefit Plan Fair Value Of Plan Assets Gross 293,751 267,762  
Business divestitures 0 (3,813)  
Foreign currency translation 0 0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0 74,016  
United States | Pension Plan [Member] | Qualified Plan [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 7,284 3,652  
Defined Benefit Plan Fair Value Of Plan Assets Gross 7,284 3,652  
United States | Pension Plan [Member] | Qualified Plan [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 286,467 264,110  
Defined Benefit Plan Fair Value Of Plan Assets Gross 286,467 264,110  
United States | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 216,981 150,179  
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 216,981 150,179  
United States | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 75,332 115,517  
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 5,846 1,586  
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 69,486 113,931  
United States | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,438 2,066  
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 1,438 2,066  
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 241,058 175,963  
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] | Real estate funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 32,686  
United States | Pension Plan [Member] | Qualified Plan [Member] | Real estate funds [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] | Real estate funds [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 15,429 12,489  
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 185,590 162,589 $ 175,534
Defined Benefit Plan Fair Value Of Plan Assets Gross 117,223 103,906  
Business divestitures 0 (13,285)  
Foreign currency translation 3,909 11,223  
Defined Benefit Plan, Plan Assets, Payment for Settlement 4,350 1,472  
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 75,236 52,436  
Defined Benefit Plan Fair Value Of Plan Assets Gross 75,236 52,436  
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 23,390 30,187  
Defined Benefit Plan Fair Value Of Plan Assets Gross 23,390 30,187  
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 18,597 21,283  
Defined Benefit Plan Fair Value Of Plan Assets Gross 18,597 21,283  
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 64,000 54,505  
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 3,752 470  
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 3,752 470  
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 44,685 28,528  
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 44,685 28,528  
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 19,871 27,797  
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 19,871 27,797  
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 26,799 23,438  
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 26,799 23,438  
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 22,116 23,673  
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 3,519 2,390  
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 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 4,367 4,178  
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