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Long-Term Debt And Lines of Credit (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 20, 2018
Debt Instrument [Line Items]    
Standby letters of credit issued $ 38,000,000.0  
2018 Credit Agreement [Member]    
Debt Instrument [Line Items]    
Revolving credit facility period, years 5 years  
2018 Credit Agreement [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Face amount of debt   $ 450,000,000
Amount outstanding $ 85,000,000.0  
Deferred financing costs 1,000,000.0  
Unused lines of credit $ 327,000,000.0  
2018 Credit Agreement [Member] | Revolving Credit Facility [Member] | LIBOR [Member]    
Debt Instrument [Line Items]    
Basis spread on variable interest rate 100.00%  
2018 Credit Agreement [Member] | Expansion Feature [Member]    
Debt Instrument [Line Items]    
Face amount of debt   $ 150,000,000