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Accounts Payable and Other Accrued Liabilities
6 Months Ended
Jun. 30, 2018
Payables and Accruals [Abstract]  
Accounts Payable and Other Accrued Liabilities
Accounts Payable and Other Accrued Liabilities
Accounts payable and other accrued liabilities consisted of the following (in thousands):
 
June 30, 2018
 
December 31, 2017
Accounts payable
$
25,556

 
$
21,591

Accrued liabilities
12,404

 
13,282

Total Accounts payable and other accrued liabilities
$
37,960

 
$
34,873


Our accounts payable balance includes vendor and independent contractor payables. Our accrued liabilities balance includes the current portion of the deferred compensation plans liability, contract liabilities from contracts with customers and other accrued liabilities.