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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Contingency [Line Items]        
Accrual withholding taxes, percent 5.00%      
Income tax rate 21.00% 21.00% 21.00% 35.00%
Income tax expense (benefit) $ 166,538,000 $ 71,198,000 $ 89,526,000  
Net refund 16,300,000      
Unrecognized tax benefits that would impact the effective tax rate      
Accrued interest and penalties, net of Federal benefit 0      
Accrued interest and penalties   0    
Deferred tax assets, valuation allowance 17,765,000 28,805,000    
Foreign tax credits 30,885,000 31,989,000    
ASU 2016-09 [Member]        
Income Tax Contingency [Line Items]        
Tax benefits related to restricted stock vestings and stock options exercises 2,200,000 3,000,000.0 3,500,000  
Tax benefits related to payment of dividends on restricted stock 611,000 583,000 484,000  
CARES Act [Member]        
Income Tax Contingency [Line Items]        
Income tax expense (benefit) 32,500,000      
Net refund 182,500,000      
Subsequent to CARES Act [Member]        
Income Tax Contingency [Line Items]        
Foreign tax credits   46,100,000    
Her Majestys Revenue And Customs H M R C [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards 16,700,000      
Swiss Federal Tax Administration F T A [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 2,500,000      
Net operating loss carryforwards, expiration Dec. 31, 2028      
Canada Revenue Agency [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards, expiration Dec. 31, 2035      
Revenue Commissioners Ireland [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 200,000      
Internal Revenue Service I R S [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 800,000      
Net operating loss carryforwards, expiration Dec. 31, 2037      
Internal Revenue Service I R S [Member] | Subsequent to CARES Act [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 0      
Tax credit carryforward expiration Dec. 31, 2028      
Foreign Country [Member]        
Income Tax Contingency [Line Items]        
Income tax expense (benefit) $ 5,065,000 $ 432,000 $ 14,323,000  
Increase (decrease) in valuation allowance (11,000,000.0)      
Tax Year 2015 [Member]        
Income Tax Contingency [Line Items]        
Net refund 1,500,000      
Tax Year 2016 [Member]        
Income Tax Contingency [Line Items]        
Net refund $ 4,700,000