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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Carrying Values and Fair Values of Financial Instruments
 
June 30, 2019
 
December 31, 2018
 
Carrying
value
 
Fair
value
 
Carrying
value
 
Fair
value
Long-term debt, less amount due within one year
$
5,901

 
$
6,240

 
$
5,896

 
$
5,873