Bankruptcy Proceedings, Emergence and Fresh Start Accounting Successor Balance Sheet (Details) $ in Thousands	Sep. 12, 2016 USD ($)
Fresh-Start Adjustment [Line Items]
Postconfirmation, Current Liabilities	$ 54,171
Postconfirmation, Additional Paid-in Capital	190,895
Fresh-Start Adjustment, Increase (Decrease), Retained Earnings (Deficit)	2,224,135
Preconfirmation, Stockholders' Equity	140,954
Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity	28,319
Fresh-Start Adjustment, Increase (Decrease), Liabilities and Stockholders' Equity	(55,751)
Revaluation of Assets [Member]
Fresh-Start Adjustment [Line Items]
Fresh-Start Adjustment, Increase (Decrease), Property and Equipment, Net	(55,751)
Fresh-Start Adjustment, Increase (Decrease), Assets	(55,751)
Revaluation of Liabilities [Member]
Fresh-Start Adjustment [Line Items]
Fresh-Start Adjustments, Increase (Decrease), Accounts Payable and Accrued Liabilities	(3,455)
Fresh-Start Adjustment, Increase (Decrease), Current Liabilities	(3,455)
Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Assets, Noncurrent	(80,615)
Fresh-Start Adjustment, Increase (Decrease), Retained Earnings (Deficit)	28,319
Predecessor [Member]
Fresh-Start Adjustment [Line Items]
Preconfirmation, Cash and Cash Equivalents	48,718
Preconfirmation, Receivables, Net	35,606
Preconfirmation, Derivative Assets	397
Preconfirmation, Prepaid and Other Current Assets	3,966
Preconfirmation, Current Assets	88,687
Preconfirmation, Property and Equipment, Net	309,261
Preconfirmation, Other Assets, Noncurrent	6,902
Preconfirmation, Assets	404,850
Preconfirmation, Accounts Payable and Accrued Liabilities	77,151
Preconfirmation, Current Derivative Liabilities	1,641
Preconfirmation, Current Maturities of Long-term Debt	113,653
Preconfirmation, Current Liabilities	192,445
Preconfirmation, Other Noncurrent Obligations	84,953
Preconfirmation, Noncurrent Derivative Liabilities	9,120
Preconfirmation, Liabilities Subject to Compromise	1,154,163
Preconfirmation, Preferred Stock	1,880
Preconfirmation, Common Stock	697
Fresh-Start Adjustment, Increase (Decrease), Common Stock	(697)
Preconfirmation, Additional Paid-in Capital	1,213,797
Fresh-Start Adjustment, Increase (Decrease), Additional Paid-in Capital	(1,213,797)
Preconfirmation, Other Deferred Compensation	3,440
Preconfirmation, Accumulated Other Comprehensive Income (Loss)	383
Preconfirmation, Treasury Stock	3,574
Preconfirmation, Retained Earnings (Deficit)	(2,252,454)
Preconfirmation, Stockholders' Equity	1,035,831
Preconfirmation, Liabilities and Stockholders' Equity	404,850
Successor [Member]
Fresh-Start Adjustment [Line Items]
Postconfirmation, Cash and Cash Equivalents	31,414
Postconfirmation, Receivables, Net	39,898
Postconfirmation, Derivative Assets	397
Postconfirmation, Prepaid and Other Current Assets	3,134
Postconfirmation, Current Assets	74,843
Postconfirmation, Property and Equipment, Net	253,510
Postconfirmation, Other Assets, Noncurrent	5,621
Postconfirmation, Assets	333,974
Postconfirmation, Accounts Payable and Accrued Liabilities	52,530
Postconfirmation, Current Derivative Liabilities	1,641
Postconfirmation, Current Liabilities	54,171
Postconfirmation, Other Noncurrent Obligations	4,438
Postconfirmation, Noncurrent Derivative Liabilities	9,120
Postconfirmation, Long-term Debt	75,350
Fresh-Start Adjustment, Increase (Decrease), Common Stock	150
Postconfirmation, Common Stock	150
Fresh-Start Adjustment, Increase (Decrease), Additional Paid-in Capital	190,745
Postconfirmation, Additional Paid-in Capital	190,745
Postconfirmation, Stockholders' Equity	190,895
Postconfirmation, Liabilities and Stockholders' Equity	$ 333,974