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Operating Leases - Operating Lease Income (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Lessor, Lease, Description [Line Items]    
Operating lease income $ 91,603 $ 103,246
Variable lease income 13,096 2,326
Total operating lease income 104,699 $ 105,572
Vessels    
Lessor, Lease, Description [Line Items]    
Operating lease income 900  
Variable lease income 2,600  
Operating lease cost $ 3,000