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Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan Fair Value Of Plan Assets Gross $ 154,673 $ 162,890  
Sales   (456)  
Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 21,283 4,592 $ 4,354
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold   28  
Actual return on plan assets still held (29) 280  
Sales 16,975    
Foreign currency translation (255) 386  
Other plan assets [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets   4,592  
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  
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  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 488,900 617,840 562,564
Defined Benefit Plan Fair Value Of Plan Assets Gross 267,762 209,271  
Business divestitures (3,813) 0  
Foreign currency translation 0 0  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 3,652 3,988  
Defined Benefit Plan Fair Value Of Plan Assets Gross 3,652 3,988  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 264,110 205,283  
Defined Benefit Plan Fair Value Of Plan Assets Gross 264,110 205,283  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 150,179 74,509  
Domestic Plan [Member] | 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  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 150,179 74,509  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 115,517 133,540  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1,586 2,766  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 113,931 130,774  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 2,066 1,222  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 2,066 1,222  
Domestic Plan [Member] | 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  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 175,963 352,481  
Domestic 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  
Domestic 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  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Real estate funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 32,686 48,294  
Domestic Plan [Member] | 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  
Domestic Plan [Member] | 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  
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 12,489 7,794  
Domestic 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 0 0  
Domestic 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]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 162,589 175,534 $ 148,514
Defined Benefit Plan Fair Value Of Plan Assets Gross 103,906 109,403  
Business divestitures (13,285) 0  
Foreign currency translation 11,223 10,491  
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 52,436 67,469  
Defined Benefit Plan Fair Value Of Plan Assets Gross 52,436 67,469  
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 30,187 37,342  
Defined Benefit Plan Fair Value Of Plan Assets Gross 30,187 37,342  
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 21,283 4,592  
Defined Benefit Plan Fair Value Of Plan Assets Gross 21,283 4,592  
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 54,505 61,648  
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    
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 470 4,633  
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 470 4,633  
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 28,528 28,761  
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 28,528 28,761  
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 27,797 29,612  
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 27,797 29,612  
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 23,438 38,717  
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 23,438 34,075  
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 4,642  
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 23,673 7,680  
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 2,390 3,088  
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 21,283    
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 4,178 4,483  
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    
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