Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 2,158	$ 42,918
Accounts receivable, net	55,976	54,721
Derivative assets, current	34,256	131,100
Other current assets	6,484	3,443
Total current assets	98,874	232,182
Oil and gas properties, full cost method
Proved properties, net	1,142,383	1,369,151
Unproved properties, not being amortized	195,609	335,452
Other property and equipment, net	11,475	12,258
Total property and equipment, net	1,349,467	1,716,861
Deferred income tax assets, noncurrent	0	46,758
Derivative assets, noncurrent	0	1,115
Other assets	9,302	10,330
Total Assets	1,457,643	2,007,246
Current liabilities
Accounts payable	41,595	74,065
Revenues and royalties payable	52,912	67,808
Accrued capital expenditures	51,647	39,225
Accrued interest	21,989	21,981
Deferred income tax liabilities, current	0	46,758
Other current liabilities	34,504	35,647
Total current liabilities	202,647	285,484
Long-term debt	1,298,196	1,236,017
Asset retirement obligations	16,955	16,183
Derivative liabilities, noncurrent	34,850	12,648
Other liabilities	15,412	12,860
Liabilities	1,568,060	1,563,192
Commitments and contingencies
Shareholders’ equity (deficit)
Common stock, $0.01 par value, 90,000,000 shares authorized; 58,974,437 issued and outstanding as of June 30, 2016 and 58,332,993 issued and outstanding as of December 31, 2015	590	583
Additional paid-in capital	1,430,124	1,411,081
Accumulated deficit	(1,541,131)	(967,610)
Total shareholders’ equity (deficit)	(110,417)	444,054
Total Liabilities and Shareholders’ Equity (Deficit)	$ 1,457,643	$ 2,007,246