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Accounts Payable and Other Accrued Liabilities
12 Months Ended
Dec. 31, 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):
 
DECEMBER 31,
 
2018
 
2017
Accounts payable
$
22,900

 
$
21,591

Accrued liabilities
15,706

 
13,282

Total Accounts payable and other accrued liabilities
$
38,606

 
$
34,873


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