Components of Selected Balance Sheet Accounts (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Other current assets:
Tubular inventory and well materials		$ 6,466	$ 5,146
Prepaid expenses		980	1,104
Other Assets, Current		7,446	6,250
Other assets:
Deferred issuance costs of the Revolver		2,578	2,857
Earnest Money Deposits	[1]	0	3,210
Other		0	2,440
Other assets		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
Accounts payable and accrued liabilities		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		0	100
Other liabilities		$ 5,211	$ 4,833

[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.