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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Examination [Line Items]      
Provision for income taxes $ 75,671 $ 98,225 $ 48,920
U.S. federal income tax rate 21.00% 21.00% 21.00%
Total foreign tax credit carryforwards $ 17,900    
Unrecognized tax benefits 125 $ 184 $ 1,990
Operating Loss Carryforwards 255,700    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 100    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   0 900
Unrecognized Tax Benefits, Increase (Decrease) Income Tax Penalties and Interest Accrued   900  
Decrease in Unrecognized Tax Benefits is Reasonably Possible 100    
Deferred Tax Assets, Net of Valuation Allowance 63,244 84,346  
Undistributed Earnings of Foreign Subsidiaries 1,200,000    
Undistributed Earnings of Foreign Subsidiaries Subjected to One Time Transition Fee 1,000,000    
Deferred Tax Liabilities, Gross 73,864 78,901  
Deferred Tax Assets, Operating Loss Carryforwards, Foreign 9,100    
Deferred Tax Assets, Deferred Income 15,000    
Deferred Tax Assets, Valuation Allowance 12,773 13,736  
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 12,773 13,736 58,446
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 510,045 $ 842,827 902,808
Domestic Tax Authority [Member]      
Income Tax Examination [Line Items]      
Operating Loss Carryforwards, Valuation Allowance     $ 35,800