Consolidated balance sheets - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents		$ 27,732
Accounts receivable, net		60,363
Inventories, net		5,138
Prepaid expenses		2,661
Total current assets		95,894
Property and equipment, net		50,641
Oil and natural gas properties, using the full cost method:
Proved		634,294
Unevaluated (excluded from the amortization base)		482,239
Accumulated depreciation, depletion, amortization and impairment		(124,180)
Total oil and natural gas properties		992,353
Other assets		418
Total assets		1,139,306
Current liabilities:
Accounts payable and accrued liabilities		75,414
Accrued payroll and benefits payable		11,276
Accrued interest payable		187
Revenue distribution payable		17,966
Long-term debt and capital leases, classified as current		3,273
Derivative instruments		8,959
Total current liabilities		117,075
Long-term debt and capital leases, less current maturities		141,386
Derivative instruments		4,167
Deferred compensation		696
Asset retirement obligations		33,216
Liabilities subject to compromise		0
Commitments and contingencies (Note 16)
Stockholders’ equity (deficit):
Preferred stock		0
Additional paid in capital		961,200
Accumulated deficit		(118,902)
Total stockholders' equity (deficit)		842,766
Total liabilities and stockholders' equity (deficit)		1,139,306
Common Class A
Stockholders’ equity (deficit):
Common stock		389
Common Class B
Stockholders’ equity (deficit):
Common stock		$ 79
Predecessor
Current assets:
Cash and cash equivalents			$ 186,480
Accounts receivable, net			46,226
Inventories, net			7,351
Prepaid expenses			3,886
Total current assets			243,943
Property and equipment, net			41,347
Oil and natural gas properties, using the full cost method:
Proved			4,323,964
Unevaluated (excluded from the amortization base)			20,353
Accumulated depreciation, depletion, amortization and impairment			(3,789,133)
Total oil and natural gas properties			555,184
Other assets			5,513
Total assets			845,987
Current liabilities:
Accounts payable and accrued liabilities			42,442
Accrued payroll and benefits payable			3,459
Accrued interest payable			732
Revenue distribution payable			9,426
Long-term debt and capital leases, classified as current	[1]		469,112
Derivative instruments			7,525
Total current liabilities			532,696
Long-term debt and capital leases, less current maturities			0
Derivative instruments			5,844
Deferred compensation			0
Asset retirement obligations			65,456
Liabilities subject to compromise			1,284,144
Commitments and contingencies (Note 16)
Stockholders’ equity (deficit):
Preferred stock			0
Additional paid in capital			425,231
Accumulated deficit			(1,467,398)
Total stockholders' equity (deficit)			(1,042,153)
Total liabilities and stockholders' equity (deficit)			845,987
Predecessor | Common Class A
Stockholders’ equity (deficit):
Common stock			4
Predecessor | Common Class B
Stockholders’ equity (deficit):
Common stock			3
Predecessor | Common Class C
Stockholders’ equity (deficit):
Common stock			2
Predecessor | Common Class E
Stockholders’ equity (deficit):
Common stock			5
Predecessor | Common Class F
Stockholders’ equity (deficit):
Common stock			0
Predecessor | Common Class G
Stockholders’ equity (deficit):
Common stock			$ 0

[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