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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Jan. 01, 2020
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]            
Other Investments $ 8,000     $ 7,500    
Operating lease liabilities 19,855          
Operating right-of-use lease assets 19,669          
Allowance for credit losses $ 21,398     $ 21,039 $ 23,298 $ 23,781
Minimum            
Property, Plant and Equipment [Line Items]            
Useful life 2 years          
Useful life 7 years          
Maximum            
Property, Plant and Equipment [Line Items]            
Useful life 40 years          
Useful life 10 years          
Accounting Standards Update 2016-02            
Property, Plant and Equipment [Line Items]            
Operating lease liabilities     $ 19,400      
Operating right-of-use lease assets     $ 19,400      
Forecast | Accounting Standards Update 2016-13 | Minimum            
Property, Plant and Equipment [Line Items]            
Allowance for credit losses   $ 40,000        
Forecast | Accounting Standards Update 2016-13 | Maximum            
Property, Plant and Equipment [Line Items]            
Allowance for credit losses   $ 44,000