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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net periodic benefit cost [Abstract]      
Settlement & curtailment (gain) loss $ (18) $ (806) $ (9,926)
Employee benefit plan expense 7,205 5,844 11,912
Supplemental Employee Retirement Plans, Defined Benefit [Member]      
Net periodic benefit cost [Abstract]      
Amortization of prior service costs (income)     3,770
Amortization of actuarial (gains) losses     1,132
Settlement & curtailment (gain) loss 0 0 (1,381)
Employee benefit plan expense 2,875 5,143 7,085
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Service cost 1,272 1,942 2,624
Interest cost 1,765 2,670 3,204
Expected return on plan assets 0 0 0
Amortization of prior service costs (income) 1,695 2,811  
Amortization of actuarial (gains) losses 1,857 2,280  
United States | Pension Plan [Member] | Qualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Service cost 6,824 7,016 9,019
Interest cost 16,272 19,026 20,756
Expected return on plan assets 31,475 34,136 39,045
Amortization of prior service costs (income) 227 303 298
Amortization of actuarial (gains) losses 7,536 0 3,102
Amortization of transition obligation 0 0 0
Settlement & curtailment (gain) loss 0 0 13,939
Employee benefit plan expense (616) (7,791) 8,069
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Service cost 5,345 5,665 5,359
Interest cost 3,697 5,101 4,962
Expected return on plan assets 6,837 6,220 7,675
Amortization of prior service costs (income) (493) (398) (449)
Amortization of actuarial (gains) losses 3,047 3,109 2,952
Amortization of transition obligation 0 0 (1)
Settlement & curtailment (gain) loss 25 961 7
Employee benefit plan expense 4,784 8,218 5,157
Continuing Operations [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Employee benefit plan expense 2,875 5,143 6,806
Continuing Operations [Member] | United States | Pension Plan [Member] | Qualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Employee benefit plan expense (616) (7,791) (2,040)
Continuing Operations [Member] | Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Employee benefit plan expense 4,784 8,218 5,043
Discontinued Operations [Member]      
Net periodic benefit cost [Abstract]      
Settlement & curtailment (gain) loss     9,200
Discontinued Operations [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Employee benefit plan expense 0 0 279
Discontinued Operations [Member] | United States | Pension Plan [Member] | Qualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Employee benefit plan expense 0 0 10,109
Discontinued Operations [Member] | Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member]      
Net periodic benefit cost [Abstract]      
Employee benefit plan expense $ 0 $ 0 $ 114