FRESH-START ACCOUNTING - SUCCESSOR CONDENSED CONSOLIDATED BALANCE SHEET (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Apr. 28, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Long-term liabilities:
Liabilities subject to compromise		$ 873,292
Fresh-Start Adjustments
Current Assets:
Cash and cash equivalents		0
Accounts receivable:
Oil and gas sales		0
Joint interest and other		0
Prepaid expenses and other		0
Inventory of oilfield equipment		0
Total current assets		0
Property and equipment (successful efforts method):
Proved properties		(2,031,373)
Less: accumulated depreciation, depletion and amortization		1,720,736
Total proved properties, net		(310,637)
Unproved properties		14,679
Wells in progress		(18,002)
Other property and equipment, net		0
Total property and equipment, net		(313,960)
Other noncurrent assets		0
Total assets		(313,960)
Current liabilities:
Accounts payable and accrued expenses		0
Oil and gas revenue distribution payable		0
Revolving credit facility - current portion		0
Total current liabilities		0
Long-term liabilities:
Ad valorem taxes		0
Asset retirement obligations for oil and gas properties		(2,599)
Liabilities subject to compromise		0
Total liabilities		(2,599)
Stockholders' equity:
Predecessor preferred stock		0
Common stock		(49)
Additional paid-in capital		(816,679)
Retained deficit		505,367
Total stockholders’ equity		(311,361)
Total liabilities and stockholders’ equity		(313,960)
Predecessor
Current Assets:
Cash and cash equivalents		96,286
Cash and cash equivalents		70,183	$ 80,565	$ 133,430	$ 21,341
Accounts receivable:
Oil and gas sales		24,876	14,479
Joint interest and other		3,028	6,784
Prepaid expenses and other		4,952	5,915
Inventory of oilfield equipment		4,218	4,685
Total current assets		133,360	112,428
Property and equipment (successful efforts method):
Proved properties		2,531,834	2,525,587
Less: accumulated depreciation, depletion and amortization		(1,720,736)	(1,694,483)
Total proved properties, net		811,098	831,104
Unproved properties		163,781	163,369
Wells in progress		18,002	18,250
Other property and equipment, net		6,056	6,245
Total property and equipment, net		998,937	1,018,968
Other noncurrent assets		2,738	3,082
Total assets		1,135,035	1,134,478
Current liabilities:
Accounts payable and accrued expenses		72,635	61,328
Oil and gas revenue distribution payable		24,937	23,773
Revolving credit facility - current portion		191,667	191,667
Total current liabilities		289,239	1,070,466
Long-term liabilities:
Ad valorem taxes		17,919	14,118
Asset retirement obligations for oil and gas properties		31,660	30,833
Liabilities subject to compromise		873,292
Total liabilities		1,212,110	1,115,417
Stockholders' equity:
Predecessor preferred stock		0	0
Common stock		49	49
Additional paid-in capital		816,679	814,990
Retained deficit		(893,803)	(795,978)
Total stockholders’ equity		(77,075)	19,061
Total liabilities and stockholders’ equity		1,135,035	$ 1,134,478
Reorganization Adjustments
Current Assets:
Cash and cash equivalents		(26,103)
Accounts receivable:
Oil and gas sales		0
Joint interest and other		0
Prepaid expenses and other		0
Inventory of oilfield equipment		0
Total current assets		(26,103)
Property and equipment (successful efforts method):
Proved properties		0
Less: accumulated depreciation, depletion and amortization		0
Total proved properties, net		0
Unproved properties		0
Wells in progress		0
Other property and equipment, net		0
Total property and equipment, net		0
Other noncurrent assets		0
Total assets		(26,103)
Current liabilities:
Accounts payable and accrued expenses		(33,701)
Oil and gas revenue distribution payable		0
Revolving credit facility - current portion		(191,667)
Total current liabilities		(225,368)
Long-term liabilities:
Ad valorem taxes		0
Asset retirement obligations for oil and gas properties		0
Liabilities subject to compromise		(873,292)
Total liabilities		(1,098,660)
Stockholders' equity:
Common stock		204
Successor warrants		4,081
Additional paid-in capital		679,836
Retained deficit		388,436
Total stockholders’ equity		1,072,557
Total liabilities and stockholders’ equity		(26,103)
Successor
Current Assets:
Cash and cash equivalents	$ 31,096	70,183
Accounts receivable:
Oil and gas sales	25,443	24,876
Joint interest and other	4,488	3,028
Prepaid expenses and other	5,032	4,952
Inventory of oilfield equipment	3,270	4,218
Total current assets	69,377	107,257
Property and equipment (successful efforts method):
Proved properties	508,955	500,461
Less: accumulated depreciation, depletion and amortization	(10,771)	0
Total proved properties, net	498,184	500,461
Unproved properties	183,534	178,460
Wells in progress	44,049	0
Other property and equipment, net	6,163	6,056
Total property and equipment, net	731,930	684,977
Other noncurrent assets	2,750	2,738
Total assets	804,063	794,972
Current liabilities:
Accounts payable and accrued expenses	50,848	38,934
Oil and gas revenue distribution payable	19,828	24,937
Revolving credit facility - current portion	0	0
Total current liabilities	72,720	63,871
Long-term liabilities:
Ad valorem taxes	8,531	17,919
Asset retirement obligations for oil and gas properties	28,973	29,061
Liabilities subject to compromise		0
Total liabilities	110,996	110,851
Stockholders' equity:
Predecessor preferred stock	0
Common stock	4,286	204
Successor warrants		4,081
Additional paid-in capital	688,033	679,836
Retained deficit	748	0
Total stockholders’ equity	693,067	684,121
Total liabilities and stockholders’ equity	$ 804,063	$ 794,972