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Long-Term Debt and Short-Term Borrowings, Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2019	Oct. 08, 2019	Oct. 01, 2019	Jan. 31, 2019
Long-term Debt [Abstract]
Long-term debt	$ 126,570		$ 104,042
Less discount on issuance of long-term debt	(181)		(192)
Less unamortized debt issuance costs	(2,816)		(2,815)
Less current maturities	0		(6,500)
Long-term portion	123,573		94,535
10.05% Senior Notes, Series C, due 2020 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 0		6,500
Interest rate	10.05%	10.05%
8.43% Senior Notes, Series D, due 2022 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 7,500		7,500
Interest rate	8.43%
Variable Rate Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 12,000		12,000
3.00% Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series A of 2019, due 2036 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 10,500		10,500
Interest rate	3.00%			3.00%
3.10% Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series B of 2019, due 2038 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 14,870		14,870
Interest rate	3.10%			3.10%
3.23% Senior Notes, due 2040 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 15,000		15,000
Interest rate	3.23%				3.23%
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 10,000		10,000
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member] | Minimum [Member]
Long-term Debt [Abstract]
Interest rate	4.00%
4.00% - 4.50% York County Industrial Development Authority Exempt Facilities Revenue Bonds, Series 2015, due 2029 - 2045 [Member] | Maximum [Member]
Long-term Debt [Abstract]
Interest rate	4.50%
4.54% Senior Notes, due 2049 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 20,000		20,000
Interest rate	4.54%					4.54%
3.24% Senior Notes, due 2050 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 30,000		0
Interest rate	3.24%
Committed Line of Credit, due 2022 [Member]
Long-term Debt [Abstract]
Long-term debt	$ 6,700		$ 7,672

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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