Details Of Certain Accounts - Other Assets, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred recertification and dry dock costs, net	$ 19,405	$ 21,464
Deferred costs	720	861
Charter deposit	12,544	12,544
Intangible assets with finite lives, net	3,679	3,809
Other	1,070	1,335
Total other assets, net	$ 37,418	$ 40,013