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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Measurements [Abstract]  
Fair Value of Assets and Liabilities Measured on a Recurring Basis
Financial instruments accounted for at fair value on a recurring basis are presented in the table below.

 
June 30, 2018
December 31, 2017
 
Level 1
 
Level 2
 
Level 1
 
Level 2
Assets
 
 
 
 
 
 
 
Money market funds
$
—

 
$
—

 
$
291

 
$
—

 
 
 
 
 
 
 
 
Liabilities
 
 
 
 
 
 
 
Cross-currency derivative instruments
$
—

 
$
78

 
$
—

 
$
25
Carrying Value and Fair Value of Debt
A summary of the carrying value and fair value of debt as of June 30, 2018 and December 31, 2017 is as follows:

 
 
June 30, 2018
 
December 31, 2017
 
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Senior notes and debentures
 
$
63,081

 
$
62,010

 
$
60,844

 
$
63,443

Credit facilities
 
$
9,036

 
$
9,099

 
$
9,387

 
$
9,440