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Subsequent Events (Details) - USD ($)	Oct. 25, 2021	Apr. 30, 2018
Senior Notes | Subsequent event | 6.0% Senior Secured Notes Due 2029
Subsequent Event [Line Items]
Face amount	$ 300,000,000
Stated interest rate	6.00%
Debt discount percentage	98.625%
Line of Credit | Revolving Credit Facility
Subsequent Event [Line Items]
Credit line under our revolving credit facility		$ 600,000,000
Line of Credit | Subsequent event | Revolving Credit Facility
Subsequent Event [Line Items]
Credit line under our revolving credit facility	$ 350,000,000

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