Long-Term Debt and Other Financial Liabilities, Collateral (Details) $ in Thousands	Dec. 31, 2022 USD ($) Vessel	Dec. 31, 2021 USD ($)
Senior Long-Term Debt [Abstract]
Net book value	$ 434,545	$ 426,467
Vessels Subject to Mortgages [Member]
Senior Long-Term Debt [Abstract]
Number of vessels serving as collateral \| Vessel	10
Net book value	$ 271,863
Bareboat Chartered Vessels [Member]
Senior Long-Term Debt [Abstract]
Number of vessels serving as collateral \| Vessel	6
Net book value	$ 162,270

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant