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Debt (Narratives) (Details) - USD ($)
 3 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Line of Credit Facility [Line Items]    
New Credit Agreement 2017 $ 545,000,000  
Maximum availability under New Revolving Credit Facility 100,000,000  
Outstanding borrowings 258,238,000  
Current portion of long term debt 29,450,000 $ 4,450,000
Deferred Costs 14,690,000 14,690,000
Accumulated Amortization, Deferred Finance Costs 7,170,000 6,645,000
Unsecured credit lines 2,471,000  
Amount drawn on unsecured credit lines 0  
Proceeds from Secured Lines of Credit 445,000,000  
Line of Credit Facility, Fair Value of Amount Outstanding 25,000,000  
Required payments [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Periodic Payment, Principal 1,113,000  
Current portion of long term debt 4,450,000  
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Deferred Costs 2,789,000 2,789,000
Accumulated Amortization, Deferred Finance Costs 1,906,000 $ 1,766,000
New Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Outstanding letters of credit 16,730,000  
New Revolving Credit Facility | Standby Letters of Credit    
Line of Credit Facility [Line Items]    
Outstanding letters of credit 15,857,000  
New Revolving Credit Facility | Letter of Credit    
Line of Credit Facility [Line Items]    
Outstanding letters of credit 873,000  
New Revolving Credit Facility | Unsecured Lines of Credit    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 14,450,000  
Outstanding borrowings $ 10,553,000