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Income Taxes (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Contingency [Line Items]      
U.S. tax rate 21.00% 21.00% 35.00%
Accrual withhilding taxes, percent 5.00%    
Unrecognized tax benefits that would impact the effective tax rate    
Accrued interest and penalties, net of Federal benefit 0    
Accrued interest and penalties 0 $ 0  
Deferred tax assets, valuation allowance 12,997,000 9,309,000  
Foreign tax credits 186,706,000 167,685,000  
US NOL carryforward $ 19,027,000    
NOL carryforward expiration Dec. 31, 2038    
Expense (benefit) from TCJA   (28,411,000)  
Minimum [Member]      
Income Tax Contingency [Line Items]      
Tax credit carryforward expiration Jan. 01, 2020    
Maximum [Member]      
Income Tax Contingency [Line Items]      
Tax credit carryforward expiration Dec. 31, 2029    
ASU 2016-02 [Member]      
Income Tax Contingency [Line Items]      
Tax benefits related to restricted stock vestings and stock options exercises $ 3,357,000 3,453,000 $ 6,951,000
Tax benefits related to payment of dividends on restricted stock 484,000 403,000 626,000
Tax Cut and Jobs Act [Member]      
Income Tax Contingency [Line Items]      
Income tax expense     8,246,000
Accrual withholding taxes     8,246,000
Her Majestys Revenue And Customs H M R C [Member]      
Income Tax Contingency [Line Items]      
Foreign NOL carryforward 10,160,000    
Canada Revenue Agency [Member]      
Income Tax Contingency [Line Items]      
Foreign NOL carryforward $ 2,511,000    
NOL carryforward expiration Dec. 31, 2035    
Foreign Country [Member]      
Income Tax Contingency [Line Items]      
Income tax expense
Additional income tax benefit resulting from correction, amount 2,509,000 3,127,000 2,982,000
IRS audit, additional income tax expense
Deferred tax assets, valuation allowance 12,671,000 $ 9,309,000  
Tax Year 2014 [Member]      
Income Tax Contingency [Line Items]      
Net refund (34,972,000)    
Interest on net refund 2,421,000    
Tax Year 2015 [Member]      
Income Tax Contingency [Line Items]      
Net refund (1,519,000)    
Interest on net refund 978,000    
Tax Year 2016 [Member]      
Income Tax Contingency [Line Items]      
Net refund (4,685,000)    
Interest on net refund $ 247,000