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Financial Instruments not Reported at Fair Value (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping
Carrying amounts of our notes payable and the related estimated fair value as of December 31, 2017 and December 31, 2016 are as follows:
 
 
 
December 31, 2017
 
December 31, 2016
 
 
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
 
Notes payable
 
$
90,321
 
$
91,449
 
$
143,119
 
$
146,790
 
Less: unamortized debt issuance costs
 
 
(400)
 
 
 
 
 
(787)
 
 
 
 
Notes payable, net
 
$
89,921
 
 
 
 
$
142,332