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



	December 31,
	2018		2017
Other current assets:
Tubular inventory and well materials	$	4,061	$	5,146
Prepaid expenses	1,064		1,104
	$	5,125	$	6,250
Other assets:
Deferred issuance costs of the Credit Facility	$	2,437	$	2,857
Deposit in escrow ¹	—		3,210
Other	44		2,440
	$	2,481	$	8,507
Accounts payable and accrued liabilities:
Trade accounts payable	$	16,507	$	22,579
Drilling costs	22,434		22,389
Royalties and revenue - related	51,212		39,287
Production, ad valorem and other taxes ²	2,418		1,275
Compensation - related	4,489		2,975
Interest	670		223
Reserve for bankruptcy claims	—		3,933
Other ²	5,970		3,520
	$	103,700	$	96,181
Other liabilities:
Asset retirement obligations	$	4,314	$	3,286
Defined benefit pension obligations	857		971
Postretirement health care benefit obligations	362		476
Other	—		100
	$	5,533	$	4,833

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¹ The December 31, 2017 amount represents amounts that had remained in the Escrow Account for the Devon Acquisition which fully funded the remaining liability due to Devon for the final settlement (see Note 5).


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