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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Summary of the fair value of financial instruments The estimated fair values of our other financial instruments, all of which are categorized in Level 1 of the fair value hierarchy, as of December 31, 2019 and 2018 have been calculated based upon available market information, and were as follows:  
 
December 31, 2019
 
December 31, 2018
 
Carrying
Amount
 
Fair
Value 
 
Carrying
Amount 
 
Fair
Value 
Senior notes
$
7,755

 
$
8,176

 
$
8,102

 
$
7,632