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FAIR VALUE MEASUREMENTS
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS
FAIR VALUE MEASUREMENTS

We account for certain assets and liabilities at fair value. The hierarchy below lists three levels of fair value based on the extent to which inputs used in measuring fair value are observable in the market. We categorize each of our fair value measurements in one of these three levels based on the lowest level input that is significant to the fair value measurement in its entirety. These levels are:
 
Level 1: Quoted prices in active markets for identical assets or liabilities;
Level 2: Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and
Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Assets and liabilities measured at fair value on a recurring basis are summarized as follows (in thousands): 
 
 
Level 1
 
Level 2
 
Level 3
 
Total
December 31, 2017:
 
 

 
 

 
 

 
 

Cash and cash equivalents
 
$
14,603

 
$

 
$

 
$

Asset retirement obligations (1) (note 10)
 

 

 
1,936

 
1,936

 
 
 
 
 
 
 
 
 
December 31, 2016:
 
 

 
 

 
 

 
 

Cash and cash equivalents
 
$
10,389

 
$

 
$

 
$

Foreign currency contracts (note 9)
 

 
195

 

 
195

Asset retirement obligations (1) (note 10)
 

 

 
2,810

 
2,810

 
 
 
 
 
 
 
 
 
(1) 
We calculate the fair value of asset retirement obligations by discounting the estimated amount using the current Treasury bill rate adjusted for our credit non-performance.
The following table provides a summary of changes in our Level 3 asset retirement obligations (in thousands): 
 
 
December 31,
 
 
2017
 
2016
 
2015
Balance, January 1
 
$
2,810

 
$
2,803

 
$
2,471

Accretion (1)
 
197

 
207

 
262

Subsequent revision of estimated obligation
 
449

 

 
70

Payments
 
(1,520
)
 
(200
)
 

Balance, December 31
 
$
1,936

 
$
2,810

 
$
2,803

 
 
 
 
 
 
 
(1) 
Included in INAP COLO "Costs of sales and services" in the accompanying consolidated statements of operations and comprehensive loss.

The fair values of our other Level 3 debt liabilities, estimated using discount cash flow analysis based on incremental borrowing rates for similar types of borrowing arrangements, are as follows (in thousands): 
 
 
December 31,
 
 
2017
 
2016
 
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Term loan
 
$
298,500

 
$
301,485

 
$
291,000

 
$
267,700

Revolving credit facility
 
5,000

 
5,050

 
35,500

 
32,600