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Assets Held for Sale Assets Held For Sale (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Assets Held for Sale [Line Items]      
Document Period End Date Jun. 30, 2020    
Assets Held For Sale, non-current $ 0   $ 77,536
Proceeds from Sale of Property, Plant, and Equipment 52,518 $ 47,302  
Gain (Loss) on Disposition of Assets $ 0    
Ultramax pool [Member]      
Assets Held for Sale [Line Items]      
Vessels sold 4    
Number of vessels held for sale   4 4