Fresh Start Accounting - (Fresh Start) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Feb. 03, 2021	Feb. 02, 2021	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 258,999	$ 314,974	$ 172,768	$ 172,768	$ 188,006	$ 188,006	$ 272,624
Restricted Cash and Cash Equivalents, Current	0	0	16,751	16,751	0	0	0
Accounts receivable, net				153,529
Income taxes receivable				8,976
Prepaid Expense, Current	17,299	15,861		31,630
Inventory and Other Current Assets	65,587	60,603		101,140
Assets held for sale				220,359
Total current assets	616,612	648,933		705,153
Property, plant and equipment, net	282,376	356,274		540,850
Operating lease right-of-use assets				33,918
Notes receivable				72,484
Restricted Cash and Cash Equivalents, Noncurrent	80,108	79,561	$ 80,179	80,179	$ 80,178	80,178	2,764
Net Balance				24,220
Total assets	1,191,012	1,199,508		1,456,804
Current liabilities:
Accounts payable	31,570	43,080		51,116
Accrued expenses	116,575	108,610		137,216
Liabilities held for sale	3,349	5,607		37,264
Total current liabilities	172,946	165,569		225,596
Decommissioning liability	150,901	190,380		169,515
Operating lease liability	14,634	19,193		23,555
Deferred income taxes	3,388	12,441		59,522
Other long-term liabilities	66,259	70,192		75,930
Total non-current liabilities				328,522
Liabilities subject to compromise				1,572,772
Total liabilities	408,128	457,775		554,118
Stockholders’ equity (deficit):
Common Stock $0.001 par value				200
Additional paid-in capital				902,486
Accumulated deficit	(125,699)	(162,178)
Total stockholders' equity	782,884	741,733		902,686		$ (338,647)	$ 49,573
Total liabilities and stockholders' equity	1,191,012	$ 1,199,508		1,456,804
Reorganization, Chapter 11, Predecessor, before Adjustment [Member]
Current assets:
Cash and cash equivalents				194,671
Accounts receivable, net				153,518
Income taxes receivable				9,146
Prepaid Expense, Current				31,630
Inventory and Other Current Assets				90,073
Assets held for sale				240,761
Total current assets				719,799
Property, plant and equipment, net				401,263
Operating lease right-of-use assets				32,488
Goodwill				138,934
Notes receivable				72,484
Restricted Cash and Cash Equivalents, Noncurrent				80,179
Net Balance				52,264
Total assets	1,456,800			1,497,411
Current liabilities:
Accounts payable				51,816
Accrued expenses				126,768
Liabilities held for sale				39,642
Total current liabilities				218,226
Decommissioning liability				134,934
Operating lease liability				23,584
Deferred income taxes				4,853
Other long-term liabilities				121,756
Total non-current liabilities				285,127
Liabilities subject to compromise				1,572,772
Total liabilities	$ 2,076,100			2,076,125
Stockholders’ equity (deficit):
common stock $0.001 par value				16
Additional paid-in capital				2,757,824
Treasury Stock at Cost				(4,290)
Accumulated other comprehensive loss, net				(67,532)
Accumulated deficit				(3,264,732)
Total stockholders' equity				(578,714)
Total liabilities and stockholders' equity				1,497,411
Reorganization Adjustments [Member]
Current assets:
Cash and cash equivalents				(21,903)
Restricted Cash and Cash Equivalents, Current				16,751
Accounts receivable, net				11
Total current assets				(5,141)
Net Balance				(10,080)
Total assets				(15,221)
Current liabilities:
Accounts payable				(700)
Accrued expenses				9,042
Liabilities held for sale				1,614
Total current liabilities				9,956
Deferred income taxes				3,100
Total non-current liabilities				3,100
Liabilities subject to compromise				(1,572,772)
Total liabilities				(1,559,716)
Stockholders’ equity (deficit):
common stock $0.001 par value				(16)
Additional paid-in capital				(2,757,824)
Treasury Stock at Cost				4,290
Common Stock $0.001 par value				200
Additional paid-in capital				902,486
Accumulated deficit				3,395,359
Total stockholders' equity				1,544,495
Total liabilities and stockholders' equity				(15,221)
Reorganization, Chapter 11, Fresh-Start Adjustment [Member]
Current assets:
Restricted Cash and Cash Equivalents, Current				16,751
Income taxes receivable				(170)
Inventory and Other Current Assets				11,067
Assets held for sale				(20,402)
Total current assets				(9,505)
Property, plant and equipment, net				139,587
Operating lease right-of-use assets				1,430
Goodwill				(138,934)
Net Balance				(17,964)
Total assets				(25,386)
Current liabilities:
Accrued expenses				1,406
Liabilities held for sale				(3,992)
Total current liabilities				(2,586)
Decommissioning liability				34,581
Operating lease liability				(29)
Deferred income taxes				51,569
Other long-term liabilities				(45,826)
Total non-current liabilities				40,295
Total liabilities				37,709
Stockholders’ equity (deficit):
Accumulated other comprehensive loss, net				67,532
Accumulated deficit				(130,627)
Total stockholders' equity				(63,095)
Total liabilities and stockholders' equity				$ (25,386)