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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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) $ 71,198,000 $ 89,526,000 $ (331,223,000)  
Net refund 16,287,000      
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 28,805,000 12,997,000    
Foreign tax credits 46,109,000 186,706,000    
Expense (benefit) from TCJA     (28,411,000)  
ASU 2016-09 [Member]        
Income Tax Contingency [Line Items]        
Tax benefits related to restricted stock vestings and stock options exercises 2,993,000 3,357,000 3,453,000  
Tax benefits related to payment of dividends on restricted stock 583,000 484,000 403,000  
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 46,109,000      
Her Majestys Revenue And Customs H M R C [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards 26,428,000      
Swiss Federal Tax Administration F T A [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 2,317,000      
Net operating loss carryforwards, expiration Dec. 31, 2028      
Canada Revenue Agency [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 1,774,000      
Net operating loss carryforwards, expiration Dec. 31, 2035      
Revenue Commissioners Ireland [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 2,300,000      
Internal Revenue Service I R S [Member]        
Income Tax Contingency [Line Items]        
Net operating loss carryforwards $ 684,000      
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      
Foreign Country [Member]        
Income Tax Contingency [Line Items]        
Income tax expense (benefit) 432,000 $ 14,323,000 $ 6,400,000  
Tax Year 2015 [Member]        
Income Tax Contingency [Line Items]        
Net refund 1,519,000      
Tax Year 2016 [Member]        
Income Tax Contingency [Line Items]        
Net refund $ 4,685,000