Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended
	Feb. 05, 2021	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (311,388)	$ 1,018,768	$ 3,658,972
Other comprehensive income (loss), net	108	0	(1,568)
Cancellation of Predecessor equity	60,343
Ending Balance	1,018,768	1,002,562	2,596,532
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(39,737)	0	(40,635)
Other comprehensive income (loss) before reclassifications	0	0	0
Amounts reclassified from AOCI	224	0	568
Other comprehensive income (loss), net	224	0	568
Cancellation of Predecessor equity	39,513
Ending Balance	0	0	(40,067)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(18,275)	0	(17,754)
Other comprehensive income (loss) before reclassifications	(116)	0	(2,136)
Amounts reclassified from AOCI	0	0	0
Other comprehensive income (loss), net	(116)	0	(2,136)
Cancellation of Predecessor equity	18,391
Ending Balance	0	0	(19,890)
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(58,012)	0	(58,389)
Other comprehensive income (loss) before reclassifications	(116)	0	(2,136)
Amounts reclassified from AOCI	224	0	568
Other comprehensive income (loss), net	108	0	(1,568)
Cancellation of Predecessor equity	57,904
Ending Balance	$ 0	$ 0	$ (59,957)