Revenue and Customers - Significant Changes in Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended
	Feb. 05, 2021	Mar. 31, 2021	Mar. 31, 2020
Change In Contract With Customer, Asset And Liability [Roll Forward]
Contract assets, beginning balance	$ 13,861	$ 0	$ 30,800
Contract liabilities, beginning balance	(59,886)	(8,287)	(65,055)
Amortization of deferred costs	(1,607)	(42)	(8,799)
Additions to deferred costs	432	888	2,578
Amortization of deferred revenue	4,142	0	15,828
Additions to deferred revenue	(25,479)	(3,129)	(19,479)
Fresh start accounting revaluation	(12,686)
Fresh start accounting revaluation	72,936
Total	(13,861)	846	(6,221)
Total	51,599	(3,129)	(3,651)
Contract assets, ending balance	0	846	24,579
Contract liabilities, ending balance	$ (8,287)	$ (11,416)	$ (68,706)