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Accrued Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities
Accrued liabilities consisted of the following (in thousands):
 
December 31,
 
2018

2017
Accrued salaries and other benefits
$
24,252

 
$
27,246

Accrued income and other taxes
11,820

 
15,661

Accrued interest
11,999

 
13,138

Derivative liability - current
—

 
134

Accrued other liabilities
30,926

 
14,937

Accrued liabilities
$
78,997

 
$
71,116