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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019 and December 31, 2018 is as follows:

 
 
September 30, 2019
 
December 31, 2018
 
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Senior notes and debentures
 
$
64,140

 
$
69,315

 
$
62,868

 
$
61,087

Credit facilities
 
$
10,759

 
$
10,842

 
$
9,959

 
$
9,608