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FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of assets and liabilities measured at fair value on a recurring basis
Assets and liabilities measured at fair value on a recurring basis are summarized as follows (in thousands):
 
 
 
Level 1
 
Level 2
 
Level 3
 
Total
September 30, 2019
 
 

 
 

 
 

 
 

Available-for-sale securities
 
$
—

 
$
2,386

 
$
—

 
$
2,386

Asset retirement obligations(1)
 
—

 
—

 
2,292

 
2,292

 
 
 
 
 
 
 
 
 
December 31, 2018
 
 

 
 

 
 

 
 

Available-for-sale securities
 
$
—

 
$
2,309

 
$
—

 
$
2,309

Asset retirement obligations(1)
 
—

 
—

 
2,090

 
2,090

 
 
 
 
 
 
 
 
 
(1) 
We calculated the fair value of asset retirement obligations by discounting the estimated amount using the Treasury bill rate adjusted for our credit risk. At September 30, 2019 and December 31, 2018, the balances are included in "Other long-term liabilities," in the accompanying condensed consolidated balance sheets.

Schedule of changes in asset retirement obligations
The following table provides a summary of changes in our Level 3 asset retirement obligations for the nine months ended September 30, 2019 (in thousands): 
 
2019
Balance, January 1, 2019
$
2,090

Accretion
202

Payments
—

Balance, September 30, 2019
$
2,292
Schedule of fair values of our Level 2 available-for-sale debt securities
The fair values of our Level 2 available-for-sale debt securities, based upon quoted prices for similar items in active markets, are as follows (in thousands):

 
 
September 30, 2019
 
 
Cost
 
Unrealized Gain
 
Unrealized Loss
 
Fair Value
Japanese Corporate Bonds
 
$
2,221

 
$
189

 
$
(114
)
 
$
2,296

Japanese Government Bonds
 
88

 
7

 
(5
)
 
90

Total Bonds
 
$
2,309

 
$
196

 
$
(119
)
 
$
2,386

 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
 
 
Cost
 
Unrealized Gain
 
Unrealized Loss
 
Fair Value
Japanese Corporate Bonds
 
$
2,184

 
$
144

 
$
(107
)
 
$
2,221

Japanese Government Bonds
 
87

 
5

 
(4
)
 
88

Total Bonds
 
$
2,271

 
$
149

 
$
(111
)
 
$
2,309
Schedule of fair value of term loan and revolving credit facility
The fair values of our Level 2 debt liabilities, based upon quoted prices for similar items in active markets, are as follows (in thousands):
 
 
 
September 30, 2019
 
December 31, 2018
 
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Term loan
 
$
427,070

 
$
330,979

 
$
429,143

 
$
428,071

Revolving credit facility
 
14,000

 
10,850

 
—

 
—