The following table summarizes components of selected balance sheet accounts as of the dates presented:



	September 30,		December 31,
	2018		2017
Other current assets:
Tubular inventory and well materials	$	6,466	$	5,146
Prepaid expenses	980		1,104
	$	7,446	$	6,250
Other assets:
Deferred issuance costs of the Credit Facility	$	2,578	$	2,857
Deposit in escrow ¹	—		3,210
Other	—		2,440
	$	2,578	$	8,507
Accounts payable and accrued liabilities:
Trade accounts payable	$	20,256	$	22,579
Drilling costs	24,222		22,389
Royalties and revenue – related	51,542		39,287
Production, ad valorem and other taxes ²	5,157		1,275
Compensation – related	4,369		2,975
Interest	613		223
Reserve for bankruptcy claims	3,940		3,933
Other ²	1,863		3,520
	$	111,962	$	96,181
Other liabilities:
Asset retirement obligations	$	3,811	$	3,286
Defined benefit pension obligations	880		971
Postretirement health care benefit obligations	520		476
Other	—		100
	$	5,211	$	4,833

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¹ Represents the amount remaining in the Escrow Account for the Devon Acquisition, which was utilized to fund the remaining liabilities due to Devon for the final settlement in March 2018 (see Note 3).


²	The amount for December 31, 2017 was reclassified from Accounts payable and accrued expenses - Other.