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Debt (Tables)
 6 Months Ended
Jun. 30, 2023
Debt [Abstract]  
Debt
 
As of
Jun. 30, 2023
    
As of
Dec. 31, 2022
  
             
Variable Rate Pennsylvania Economic Development Financing Authority
Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029
   $
12,000
     $
12,000
  
3.00% Pennsylvania Economic Development Financing Authority Exempt
Facilities Revenue Refunding Bonds, Series A of 2019, due 2036
    
10,500
      
10,500
  
3.10% Pennsylvania Economic Development Financing Authority Exempt
Facilities Revenue Refunding Bonds, Series B of 2019, due 2038
    
14,870
      
14,870
  
3.23% Senior Notes, due 2040
    
15,000
      
15,000
  
4.00% - 4.50% York County Industrial Development Authority Exempt
Facilities Revenue Bonds, Series 2015, due 2029 - 2045
    
10,000
      
10,000
  
4.54% Senior Notes, due 2049
    
20,000
      
20,000
  
3.24% Senior Notes, due 2050
    
30,000
      
30,000
  
5.50% Senior Notes, due 2053     40,000       –  
Committed Line of Credit, due September 2024
    
8,127
      
29,740
  
Total long-term debt
    
160,497
      
142,110
  
Less discount on issuance of long-term debt
    
(152
)
    
(158
)
 Less unamortized debt issuance costs     (2,574 )     (2,487 )
Long-term portion
  
$
157,771
    
$
139,465