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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
OPERATING ACTIVITIES        
Net loss $ (4,463,800) $ (29,200) $ (4,857,600) $ (192,200)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation 159,600 66,100 540,800 609,700
Gain (Loss) on Disposition of Assets (6,000) (21,200) (11,800) (1,800)
Amortization Of Debt Issuance Costs, Notes Receivable 0 (20,800) 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (5,400) (8,700) (14,600) (4,300)
EQUITY IN EARNINGS (LOSSES) OF ARO 3,100 6,100 (7,800) (12,600)
Deferred income tax expense (18,200) (21,300) (105,700) 23,900
Amortization, Net (4,800) 2,300 6,200 (16,800)
Share-based Payment Arrangement, Noncash Expense 4,800 4,300 21,400 37,300
Amortization of Debt Discount (Premium) 0 500 36,800 31,500
Asset Impairment Charges 756,500 0 3,646,200 104,000
Business Combination, Bargain Purchase, Gain Recognized And Adjustment 0 0 6,300 (637,000)
Gain (Loss) on Extinguishment of Debt 0 0 3,100 194,100
Debtor in Possession financing fees and payments on Backstop Agreement 0 0 40,000 0
Professional fees 3,487,300 0 436,400 0
Other Noncash Income (Expense) (7,300) (300) (33,300) (16,000)
Changes in operating assets and liabilities, net of acquisition (68,500) (10,300) 22,000 52,500
Payment for Pension Benefits 22,500 2,700 12,100 13,200
Net Cash Provided by (Used in) Operating Activities, Total (39,800) (26,200) (251,700) (276,900)
INVESTING ACTIVITIES        
Additions to property and equipment (8,700) (50,200) (93,800) (227,000)
Proceeds from Sale of Property, Plant, and Equipment 30,100 25,100 51,800 17,700
Cash Acquired from Acquisition 0 0 0 931,900
Maturities of short-term investments 0 0 0 474,000
Purchases of short-term investments 0 0 0 (145,000)
Net Cash Provided by (Used in) Investing Activities, Total 21,400 (25,100) (42,000) 1,051,600
FINANCING ACTIVITIES        
Proceeds from issuance of senior notes 520,000 0 0 0
Payments To Predecessor Creditors (129,900) 0 0 0
Proceeds from Lines of Credit 0 0 596,000 215,000
Payments for Debtor-in-possession financing fees and backstop agreement 0 0 (40,000) 0
Repayments of Lines of Credit 0 0 (15,000) (215,000)
Reduction of long-term borrowings 0 0 (9,700) (928,100)
Payments to Noncontrolling Interests 0 0 (7,200) 0
Payments of Financing Costs 0 0 0 9,500
Cash dividends paid 0 0 0 (4,500)
Other (1,400) 0 (1,900) (10,200)
Net cash provided by (used in) financing activities 388,700 0 522,200 (952,300)
Effect of exchange rate changes on cash and cash equivalents (100) (100) 100 (300)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 370,200 (51,400) 228,600 (177,900)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 696,000 644,600 325,800 $ 97,200
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 325,800 607,600    
CASH AND CASH EQUIVALENTS, END OF YEAR $ 607,600 $ 608,700 $ 325,800