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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net periodic benefit cost [Abstract]        
Defined contribution plan expense $ 15,001 $ 12,530 $ 46,114 $ 39,071
Qualified Plan [Member] | Defined benefit pension plans | United States        
Net periodic benefit cost [Abstract]        
Service cost 1,784 1,706 5,351 5,118
Interest cost 3,401 4,068 10,204 12,204
Expected return on plan assets (7,245) (7,869) (21,735) (23,607)
Prior service cost (credit) 53 57 159 170
Recognized actuarial loss 2,503 1,884 7,509 5,652
Net periodic (income)/expense 496 (154) 1,488 (463)
Qualified Plan [Member] | Defined benefit pension plans | Foreign Pension Plans, Defined Benefit [Member]        
Net periodic benefit cost [Abstract]        
Service cost 1,398 1,366 4,238 3,954
Interest cost 674 839 2,036 2,460
Expected return on plan assets (1,793) (1,719) (5,412) (5,033)
Prior service cost (credit) (163) (126) (494) (365)
Recognized actuarial loss 979 777 2,968 2,253
Net periodic (income)/expense 1,095 1,137 3,336 3,269
Nonqualified Plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]        
Net periodic benefit cost [Abstract]        
Service cost 390 318 1,171 954
Interest cost 308 441 924 1,324
Prior service cost (credit) 383 424 1,148 1,271
Recognized actuarial loss (418) (464) (1,254) (1,393)
Net periodic (income)/expense $ 663 $ 719 $ 1,989 $ 2,156