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ADDITIONAL FINANCIAL STATEMENT INFORMATION (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Accounts receivable:
Oil, natural gas and natural gas liquids revenues	$ 26,584		$ 26,432
Joint interest accounts	9,556		7,369
Other	1,686		1,917
Total	37,826		35,718
Prepaids and other:
Prepaids	6,625		3,503
Income tax receivable	1,250		1,250
Funds in escrow	6,732
Other	35		35
Total	14,642		4,788
Funds in escrow and other:
Funds in escrow	578		570
Other	560		1,611
Total	1,138		2,181
Accounts payable and accrued liabilities:
Trade payables	51,594		68,959
Accrued oil and natural gas capital costs	25,445		41,461
Revenues and royalties payable	18,970		20,526
Accrued interest expense	3,480		16,971
Accrued employee compensation	2,621		3,421
Accrued lease operating expenses	10,029		6,292
Other	439		218
Total	$ 112,578	$ 157,763	$ 157,848

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