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Debt
 6 Months Ended
Jun. 30, 2021
Debt [Abstract]  
Debt

4.  Debt

For the six months ended June 30, 2021, the Company did not enter into any new long-term debt arrangements or modify its outstanding long-term debt, which is summarized in the table below.

  
As of
Jun. 30, 2021
    
As of
Dec. 31, 2020
  
             
8.43% Senior Notes, Series D, due 2022
  
$
7,500
    
$
7,500
  
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
  
Committed Line of Credit, due September 2023
    
10,035
      
6,700
  
Total long-term debt
    
129,905
      
126,570
  
Less discount on issuance of long-term debt
    
(175
)
    
(181
)
Less unamortized debt issuance costs
    
(2,734
)
    
(2,816
)
Long-term portion
  
$
126,996
    
$
123,573
  

Subsequent to June 30, 2021, the Company renewed its committed line of credit and extended the maturity date to September 2023.