Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 22	$ 21
Accounts receivable:
Joint interest owners	193	117
Oil, NGLs and gas sales	9,521	9,678
Derivative instruments	1,250	1,398
Prepaid expenses and other current assets	1,558	5,486
Total current assets	12,544	16,700
PROPERTIES AND EQUIPMENT:
Oil and gas properties, at cost, using the successful efforts method of accounting	1,944,388	1,930,577
Furniture, fixtures and equipment	5,689	5,658
Total oil and gas properties and equipment	1,950,077	1,936,235
Less accumulated depletion, depreciation and amortization	(868,923)	(853,359)
Net oil and gas properties and equipment	1,081,154	1,082,876
Total assets	1,093,698	1,099,576
CURRENT LIABILITIES:
Accounts payable	10,028	9,450
Oil, NGLs and gas sales payable	5,438	5,363
Derivative instruments	2,430	2,181
Accrued liabilities	8,761	8,073
Total current liabilities	26,657	25,067
NON-CURRENT LIABILITIES:
Senior secured credit facility, net	290,449	289,275
Senior notes, net	84,260	84,185
Deferred income taxes	80,492	82,102
Asset retirement obligations	11,042	11,065
Other non-current liabilities	604	466
Total liabilities	493,504	492,160
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.01 par value, 10,000,000 shares authorized, none outstanding
Common stock, $0.01 par value, 180,000,000 shares authorized, 94,605,086 and 94,533,246 issued and outstanding, respectively	946	945
Additional paid-in capital	742,614	742,391
Accumulated deficit	(143,366)	(135,920)
Total stockholders’ equity	600,194	607,416
Total liabilities and stockholders’ equity	$ 1,093,698	$ 1,099,576

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.