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Accrued Liabilities
 12 Months Ended
Dec. 31, 2019
Accrued Liabilities [Abstract]  
Accrued Liabilities ACCRUED LIABILITIES
Accrued liabilities consisted of the following as of December 31:
20192018
 (In thousands)
Employee costs$17,832  $20,315  
Lease operating expenses9,200  12,756  
Interest payable6,562  6,635  
Third-party credits3,691  2,129  
Taxes3,450  1,378  
Other5,827  4,710  
Total accrued liabilities$46,562  $47,923