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DETAILS OF SELECTED BALANCE SHEET ACCOUNTS
 12 Months Ended
Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]  
DETAILS OF SELECTED BALANCE SHEET ACCOUNTS DETAILS OF SELECTED BALANCE SHEET ACCOUNTS
Additional information regarding selected balance sheet accounts at December 31, 2023 and 2022 is presented below (in thousands): 
 December 31, 2023December 31, 2022
Accounts receivable, net:
Trade  $93,527 $65,563 
Unbilled revenue  
46,331 52,547 
Other3,563 1,944 
Total accounts receivable  
143,421 120,054 
Allowance for credit losses  (199)(299)
Total accounts receivable, net
$143,222 $119,755 
 December 31, 2023December 31, 2022
Inventories:
Finished goods and purchased products  $5,648 $5,538 
Raw materials  1,334 1,369 
Total inventories
$6,982 $6,907 
 
 Estimated
Useful Life 
(in years)		December 31, 2023December 31, 2022
Property, plant and equipment, net:
Land  $27,988 $25,528 
Accommodations assets  
3-15
1,378,408 1,464,476 
Buildings and leasehold improvements
7-20
14,603 15,516 
Machinery and equipment
4-7
13,255 11,775 
Office furniture and equipment
3-7
67,248 62,725 
Vehicles
3-5
10,025 8,411 
Construction in progress12,087 1,771 
Total property, plant and equipment1,523,614 1,590,202 
Accumulated depreciation(1,253,051)(1,288,312)
Total property, plant and equipment, net $270,563 $301,890 
 
 December 31, 2023December 31, 2022
Accrued liabilities:
Accrued compensation$33,854 $34,358 
Accrued taxes, other than income taxes3,997 2,873 
Other2,672 1,980 
Total accrued liabilities
$40,523 $39,211 
 
December 31, 2023December 31, 2022
Contract liabilities (Deferred revenue):
Current contract liabilities (1)
$4,849 $991 
Noncurrent contract liabilities (1)
8,068 — 
Total contract liabilities (Deferred revenue)$12,917 $991 

(1)Current contract liabilities and Noncurrent contract liabilities are included in "Deferred revenue" and "Other noncurrent liabilities," respectively, in our consolidated balance sheets.

Deferred revenue typically consists of upfront payments received before we satisfy the associated performance obligation. The increase in deferred revenue from December 31, 2022 to December 31, 2023 was due to payments received from a customer for village enhancements in Australia and a payment received from a customer related to an asset transportation contract, which will all be recognized over the contracted terms.