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Operating Leases - Operating Lease Income (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Lessor, Lease, Description [Line Items]    
Operating lease income $ 135,498 $ 140,586
Variable lease income 15,030 568
Total operating lease income 150,528 $ 141,154
Vessels    
Lessor, Lease, Description [Line Items]    
Operating lease income 900  
Variable lease income 2,600  
Operating lease cost $ 3,000