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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Assets and liabilities measured on recurring basis
The following table summarizes liabilities measured at fair value on a recurring basis (in thousands):
Fair Value at March 31, 2018
 
Level 1
 
Level 2
 
Level 3
 
Total
Interest rate swap
 
$
—

 
$
(108
)
 
$
—

 
$
(108
)
 
 
 
 
 
 
 
 
 
Fair Value at December 31, 2017
 
 

 
 

 
 

 
 

Interest rate swaps
 
$
—

 
$
(221
)
 
$
—

 
$
(221
)
Fixed-rate debt
We had fixed-rate debt outstanding as follows (in thousands):
 
March 31,
2018
 
December 31,
2017
Fixed-rate debt on Consolidated Balance Sheets
$
1,786

 
$
1,855

Estimated fair value of fixed-rate debt
$
1,828

 
$
1,915