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Accounts Payable and Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of Accounts Payable and Accrued Liabilities
Accounts payable and accrued liabilities at December 31, 2018 and 2017 consisted of the following (in thousands):
 
December 31,
 
2018
 
2017
 
 
 
 
Accounts payable
$
31,960

 
$
33,912

Accrued compensation
30,822

 
25,510

Accrued property and other taxes
16,301

 
16,908

Accrued severance and other charges
2,328

 
1,444

Income taxes
12,075

 
8,091

Accrued purchase orders and other
30,495

 
23,020

Total accounts payable and accrued liabilities
$
123,981

 
$
108,885