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Accrued Liabilities
12 Months Ended
Dec. 31, 2020
Payables and Accruals [Abstract]  
Accrued Liabilities

13. Accrued Liabilities

Accrued liabilities consisted of the following (in thousands):

December 31, 

    

2020

    

2019

Accrued salaries and other benefits

$

16,332

$

19,300

Accrued income and other taxes

 

11,414

 

11,019

Accrued interest

 

22,693

 

16,462

Derivative liability - current

 

4,809

 

593

Other accrued liabilities

 

21,745

 

20,471

Accrued liabilities

$

76,993

$

67,845