Fresh Start Accounting - Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 21, 2017	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 27,732	$ 45,123
Accounts receivable, net	60,363	46,837
Inventories, net	5,138	6,885
Prepaid expenses	2,661	4,398
Derivative instruments	0	19,058
Total current assets	95,894	122,301
Property and equipment, net	50,641	57,378
Oil and natural gas properties, using the full cost method:
Proved	634,294	604,065
Unevaluated (excluded from the amortization base)	482,239	585,574
Accumulated depreciation, depletion, amortization and impairment	124,180
Total oil and natural gas properties	992,353	1,189,639
Derivative instruments	0	14,295
Other assets	418	8,499
Total assets	1,139,306	1,392,112
Current liabilities:
Accounts payable and accrued liabilities	75,414	61,676
Accrued payroll and benefits payable	11,276	9,552
Accrued interest payable	187
Revenue distribution payable	17,966	11,025
Long-term debt and capital leases, classified as current	3,273	4,632
Total current liabilities	117,075	86,885
Long-term debt and capital leases, less current maturities	141,386	291,429
Deferred compensation	696	519
Asset retirement obligations	33,216	64,216
Liabilities subject to compromise	0
Commitments and contingencies
Stockholders’ equity (deficit):
Common stock		450
Additional paid in capital	961,200	948,613
(Accumulated deficit) retained earnings	(118,902)
Total stockholders' equity (deficit)	842,766	949,063
Total liabilities and stockholders' equity (deficit)	$ 1,139,306	1,392,112
Reorganization Adjustments
Current assets:
Cash and cash equivalents		(135,333)
Prepaid expenses		(535)
Total current assets		(135,868)
Oil and natural gas properties, using the full cost method:
Other assets		2,410
Total assets		(133,458)
Current liabilities:
Accounts payable and accrued liabilities		(2,737)
Accrued payroll and benefits payable		2,186
Accrued interest payable		(2,095)
Revenue distribution payable		3,050
Long-term debt and capital leases, classified as current		(464,182)
Total current liabilities		(463,778)
Long-term debt and capital leases, less current maturities		291,429
Deferred compensation		519
Liabilities subject to compromise		1,281,096
Commitments and contingencies
Stockholders’ equity (deficit):
Common stock		450
Additional paid in capital		948,613
(Accumulated deficit) retained earnings		795,844
Total stockholders' equity (deficit)		1,319,468
Total liabilities and stockholders' equity (deficit)		(133,458)
Fresh Start Adjustments
Current assets:
Property and equipment, net		18,987
Oil and natural gas properties, using the full cost method:
Proved		(3,751,511)
Unevaluated (excluded from the amortization base)		559,535
Accumulated depreciation, depletion, amortization and impairment		(3,811,326)
Total oil and natural gas properties		619,350
Other assets		590
Total assets		638,927
Current liabilities:
Asset retirement obligations		(2,757)
Commitments and contingencies
Stockholders’ equity (deficit):
(Accumulated deficit) retained earnings		641,684
Total stockholders' equity (deficit)		641,684
Total liabilities and stockholders' equity (deficit)		638,927
Predecessor
Current assets:
Cash and cash equivalents		180,456
Cash and cash equivalents		45,123	$ 186,480		$ 17,065	$ 31,492
Accounts receivable, net		46,837	46,226
Inventories, net		6,885	7,351
Prepaid expenses		4,933	3,886
Derivative instruments		19,058	0
Total current assets		258,169	243,943
Property and equipment, net		38,391	41,347
Oil and natural gas properties, using the full cost method:
Proved		4,355,576	4,323,964
Unevaluated (excluded from the amortization base)		26,039	20,353
Accumulated depreciation, depletion, amortization and impairment		3,811,326	3,789,133
Total oil and natural gas properties		570,289	555,184
Derivative instruments		14,295	0
Other assets		5,499	5,513
Total assets		886,643	845,987
Current liabilities:
Accounts payable and accrued liabilities		64,413	42,442
Accrued payroll and benefits payable		7,366	3,459
Accrued interest payable		2,095	732
Revenue distribution payable		7,975	9,426
Long-term debt and capital leases, classified as current		468,814	469,112	[1]
Total current liabilities		550,663	532,696
Long-term debt and capital leases, less current maturities			0
Deferred compensation			0
Asset retirement obligations		66,973	65,456
Liabilities subject to compromise		1,281,096	1,284,144
Commitments and contingencies
Stockholders’ equity (deficit):
Common stock		14
Additional paid in capital		425,425	425,231
(Accumulated deficit) retained earnings		(1,437,528)	(1,467,398)
Total stockholders' equity (deficit)		(1,012,089)	(1,042,153)		$ (620,357)	$ 711,858
Total liabilities and stockholders' equity (deficit)		886,643	$ 845,987
Predecessor | Reorganization Adjustments
Stockholders’ equity (deficit):
Common stock		(14)
Additional paid in capital		$ (425,425)

[1] Senior Notes have not been included in this table as they were classified as “Liabilities subject to compromise” at December 31, 2016. Additionally, as a result of certain debt defaults which occurred in early 2016 and remained uncured during the pendency of the Chapter 11 Cases, all outstanding long-term debt was classified as current at December 31, 2016