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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
Fair Value Measurements [Abstract]  
Carrying Value and Fair Value of Debt
A summary of the carrying value and fair value of debt as of September 30, 2021 and December 31, 2020 is as follows:

September 30, 2021December 31, 2020
Carrying ValueFair ValueCarrying ValueFair Value
Senior notes and debentures$76,950 $85,880 $72,671 $84,163 
Credit facilities$11,422 $11,428 $10,081 $10,063