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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Net periodic benefit cost [Abstract]          
Defined contribution plan expense $ 16,052 $ 12,493 $ 26,541 $ 31,113  
Qualified Plan [Member] | Defined benefit pension plans | United States          
Net periodic benefit cost [Abstract]          
Service cost 1,784 1,706   3,567 $ 3,412
Interest cost 3,401 4,068   6,803 8,136
Expected return on plan assets (7,245) (7,869)   (14,490) (15,738)
Prior service cost (credit) 53 57   106 114
Recognized actuarial loss 2,503 1,884   5,006 3,768
Net periodic (income)/expense 496 (154)   992 (308)
Qualified Plan [Member] | Defined benefit pension plans | Foreign Pension Plans, Defined Benefit [Member]          
Net periodic benefit cost [Abstract]          
Service cost 1,397 1,295   2,839 2,588
Interest cost 695 796   1,363 1,621
Expected return on plan assets (1,820) (1,637)   (3,619) (3,314)
Prior service cost (credit) (162) (120)   (330) (239)
Recognized actuarial loss 989 735   1,989 1,476
Net periodic (income)/expense 1,099 1,069   2,242 2,132
Nonqualified Plan [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]          
Net periodic benefit cost [Abstract]          
Service cost 390 318   781 636
Interest cost 308 442   616 883
Prior service cost (credit) 383 424   766 848
Recognized actuarial loss (418) (465)   (836) (929)
Net periodic (income)/expense $ 663 $ 719   $ 1,327 $ 1,438