Commitments and Contingencies (Estimated Obligations and Companies Share for the Annual Charter Payment) (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Estimated obligation and company share for annual charter payment
2021	$ 10,245
2022	7,382
Total	17,627
Consortium [Member]
Estimated obligation and company share for annual charter payment
2021	32,988
2022	23,769
Total	$ 56,757

Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	us-gaap_ContractualObligationDueInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant