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Leases - Maturities Of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
Less than one year $ 58,445 $ 60,649
One to two years 57,354 57,541
Two to three years 28,840 39,229
Three to four years 4,205 6,844
Four to five years 1,591 2,340
Over five years 3,884 4,054
Total lease payments 154,319 170,657
Less: imputed interest (15,422) (18,049)
Total operating lease liabilities 138,897 152,608
Current operating lease liabilities 50,321 51,599
Non-current operating lease liabilities 88,576 101,009
Vessels    
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
Less than one year 52,620 54,621
One to two years 52,105 52,106
Two to three years 24,203 34,580
Three to four years   2,470
Over five years 0  
Total lease payments 128,928 143,777
Less: imputed interest (11,088) (13,352)
Total operating lease liabilities 117,840 130,425
Current operating lease liabilities 45,598 46,748
Non-current operating lease liabilities 72,242 83,677
Facilities and Equipment    
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
Less than one year 5,825 6,028
One to two years 5,249 5,435
Two to three years 4,637 4,649
Three to four years 4,205 4,374
Four to five years 1,591 2,340
Over five years 3,884 4,054
Total lease payments 25,391 26,880
Less: imputed interest (4,334) (4,697)
Total operating lease liabilities 21,057 22,183
Current operating lease liabilities 4,723 4,851
Non-current operating lease liabilities $ 16,334 $ 17,332