Fair Value Measurements (Carrying Amount and Fair Value) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial liabilities:
Finance leases, including current portion	$ 10,523	$ 12,660
Carrying Amount
Financial assets:
Cash and cash equivalents	173	363
Financial liabilities:
Long-term debt, including current portion	85,370	86,638
Finance leases, including current portion	10,523	12,660
Fair Value
Financial assets:
Cash and cash equivalents	173	363
Financial liabilities:
Long-term debt, including current portion	76,424	76,684
Finance leases, including current portion	$ 9,076	$ 11,576