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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net periodic benefit cost [Abstract]    
Defined contribution plan expense $ 15,061 $ 14,048
Qualified Plan [Member] | Defined benefit pension plans | United States    
Net periodic benefit cost [Abstract]    
Service cost 1,784 1,706
Interest cost 3,401 4,068
Expected return on plan assets (7,245) (7,869)
Prior service cost (credit) 53 57
Recognized actuarial loss 2,503 1,884
Net periodic (income)/expense 496 (154)
Qualified Plan [Member] | Defined benefit pension plans | Foreign Pension Plans, Defined Benefit [Member]    
Net periodic benefit cost [Abstract]    
Service cost 1,442 1,293
Interest cost 667 825
Expected return on plan assets (1,799) (1,677)
Prior service cost (credit) (169) (119)
Recognized actuarial loss 1,000 742
Net periodic (income)/expense 1,141 1,064
Nonqualified Plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]    
Net periodic benefit cost [Abstract]    
Service cost 390 318
Interest cost 308 441
Prior service cost (credit) 383 424
Recognized actuarial loss (418) (464)
Net periodic (income)/expense $ 663 $ 719