Long-Term Debt and Short-Term Borrowings, Variable Rate Long-Term Debt (Details) - Variable Rate Pennsylvania Economic Development Financing Authority Exempt Facilities Revenue Refunding Bonds, Series 2008A, due 2029 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Variable Rate Long-Term Debt [Abstract]
Face value	$ 12,000
Maturity date	Oct. 01, 2029
Annual average variable interest rate	0.07%	0.62%
Variable interest rate at year end	0.13%	0.12%
Period in which to reimburse bank for purchase price of tendered bonds that have not been remarketed	14 months