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Accrued Liabilities
 12 Months Ended
Dec. 31, 2018
Accrued Liabilities  
Accrued Liabilities

 

8.  ACCRUED LIABILITIES

 

The following table sets forth the components of accrued liabilities, in thousands:

 

 

 

 

 

 

 

 

 

 

As of

 

 

December 31, 

 

December 31, 

 

    

2018

    

2017

Accrued liabilities:

 

 

 

 

 

 

Salaries, wages, and commissions

 

$

34,085

 

$

25,470

Insurance liabilities

 

 

25,212

 

 

19,770

Deferred revenue

 

 

19,963

 

 

9,275

Interest payable on long-term debt

 

 

3,951

 

 

 —

Other

 

 

21,025

 

 

20,572

Total accrued liabilities

 

$

104,236

 

$

75,087

 

See Note 1 – Summary of Significant Accounting Policies for discussion of our deferred revenue balances and related revenue recognition policy.