Consolidated balance sheets - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current assets:      
Cash and cash equivalents $ 32,494    
Accounts receivable, net 50,418    
Inventories, net 6,847    
Prepaid expenses 4,319    
Derivative instruments 10,001    
Total current assets 104,079    
Property and equipment, net 56,136    
Oil and natural gas properties, using the full cost method:      
Proved 608,789    
Unevaluated (excluded from the amortization base) 586,672    
Accumulated depreciation, depletion, amortization and impairment (3,034)    
Total oil and natural gas properties 1,192,427    
Derivative instruments 9,544    
Other assets 5,988    
Total assets 1,368,174    
Current liabilities:      
Accounts payable and accrued liabilities 60,262    
Accrued payroll and benefits payable 7,358    
Accrued interest payable 0    
Revenue distribution payable 12,535    
Long-term debt and capital leases, classified as current 4,588    
Derivative instruments 0    
Total current liabilities 84,743    
Long-term debt and capital leases, less current maturities 288,991    
Derivative instruments 0    
Deferred compensation 529    
Asset retirement obligations 64,531    
Liabilities subject to compromise 0    
Commitments and contingencies (Note 10)    
Stockholders' equity (deficit):      
Preferred stock 0    
Additional paid in capital 948,613    
Accumulated deficit (19,683)    
Total stockholders' equity (deficit) 929,380    
Total liabilities and stockholders' equity (deficit) 1,368,174    
Predecessor      
Current assets:      
Cash and cash equivalents   $ 186,480 $ 17,065
Accounts receivable, net   46,226 79,000
Inventories, net   7,351 12,329
Prepaid expenses   3,886 3,700
Derivative instruments   0 143,737
Total current assets   243,943 255,831
Property and equipment, net   41,347 48,962
Oil and natural gas properties, using the full cost method:      
Proved   4,323,964 4,128,193
Unevaluated (excluded from the amortization base)   20,353 66,905
Accumulated depreciation, depletion, amortization and impairment   (3,789,133) (3,396,261)
Total oil and natural gas properties   555,184 798,837
Derivative instruments   0 19,501
Deferred income taxes   0 53,914
Other assets   5,513 4,268
Total assets   845,987 1,181,313
Current liabilities:      
Accounts payable and accrued liabilities   42,442 66,222
Accrued payroll and benefits payable   3,459 15,305
Accrued interest payable   732 23,303
Revenue distribution payable   9,426 12,391
Long-term debt and capital leases, classified as current   469,112 1,583,701
Derivative instruments   7,525 0
Deferred income taxes     53,914
Total current liabilities   532,696 1,754,836
Long-term debt and capital leases, less current maturities   0  
Derivative instruments   5,844 0
Deferred compensation   0 400
Asset retirement obligations   65,456 46,434
Liabilities subject to compromise   1,284,144  
Commitments and contingencies (Note 10)  
Stockholders' equity (deficit):      
Preferred stock   0 0
Additional paid in capital   425,231 431,307
Accumulated deficit   (1,467,398) (1,051,678)
Total stockholders' equity (deficit)   (1,042,153) (620,357)
Total liabilities and stockholders' equity (deficit)   845,987 1,181,313
Common Class A      
Stockholders' equity (deficit):      
Common stock 371    
Common Class A | Predecessor      
Stockholders' equity (deficit):      
Common stock   4 4
Common Class B      
Stockholders' equity (deficit):      
Common stock $ 79    
Common Class B | Predecessor      
Stockholders' equity (deficit):      
Common stock   3 3
Common Class C | Predecessor      
Stockholders' equity (deficit):      
Common stock   2 2
Common Class E | Predecessor      
Stockholders' equity (deficit):      
Common stock   5 5
Common Class F | Predecessor      
Stockholders' equity (deficit):      
Common stock   0 0
Common Class G | Predecessor      
Stockholders' equity (deficit):      
Common stock   $ 0 $ 0