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Lease Accounting (Tables)
9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Schedule of Lease Revenues for Operating Leases Our lease revenues for these arrangements (inclusive of fixed and variable consideration) are reflected in the table below:
Three Months Ended
September 30,
Nine Months Ended
 September 30,
2021202020212020
M/T American Phoenix$4,140 $6,787 $11,379 $20,164 
Free State Pipeline (1)
— 1,467 — 4,889 
(1) We sold the Free State pipeline to a subsidiary of Denbury, Inc. ("Denbury") on October 30, 2020.