Fresh Start Accounting (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	8 Months Ended		9 Months Ended
	Feb. 02, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Oct. 01, 2021	Dec. 31, 2020
Fresh Start Adjustment 1 [Line Items]
Preconfirmation, Assets	$ 1,456,804	$ 1,255,783	$ 1,255,783	$ 1,255,783	$ 1,255,783			$ 1,501,079
Postconfirmation, Liabilities	554,118	485,286	485,286	485,286	$ 485,286			1,839,726
Internal Rate Of Return					17.60%
Perpetuity Growth Rate					3.00%
Credit Adjusted Risk-Free Rate					5.60%
Reorganization Expenses, Discount Rate					5.30%
Total current assets	705,153	644,206	644,206	644,206	$ 644,206			$ 715,508
Reorganization Expenses		4,700	1,300		20,500
Reorganization Expenses, Cash Used In Operating Activities	3,100				13,700
Reorganization Items	335,560			0		$ 0
Reorganization Expenses, Professional Fees, Expense	2,700
Reorganization Expenses, Professional Fees, Lease Rejection Damages	400
Inventory write down					6,500
Minimum [Member]
Fresh Start Adjustment 1 [Line Items]
Bankruptcy Proceedings, Enterprise Value		710,000	710,000	710,000	710,000
Maximum [Member]
Fresh Start Adjustment 1 [Line Items]
Bankruptcy Proceedings, Enterprise Value		880,000	880,000	880,000	880,000
Reorganization, Chapter 11, Predecessor, before Adjustment [Member]
Fresh Start Adjustment 1 [Line Items]
Preconfirmation, Assets	1,497,411	1,456,800	1,456,800	1,456,800	1,456,800
Postconfirmation, Liabilities	2,076,125	2,076,100	2,076,100	2,076,100	2,076,100
Total current assets	719,799
Well Services [Member]
Fresh Start Adjustment 1 [Line Items]
Preconfirmation, Assets		697,291	$ 697,291	$ 697,291	$ 697,291
Reorganization Items	$ 31,816
Shut Down Cost		8,900
Well Services [Member] | Cost of Sales [Member]
Fresh Start Adjustment 1 [Line Items]
Inventory write down		6,500
Well Services [Member] | Cost Of Services [Member]
Fresh Start Adjustment 1 [Line Items]
Other Shut Down Cost		$ 2,400
Subsequent Event [Member]
Fresh Start Adjustment 1 [Line Items]
Net book value							$ 22,800