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Debt And Liquidity (2023 Senior Secured Notes) (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 950,139,000
Debt Instrument, Issue Price		0.97456
Debt Instrument, Event Of Default, Percentage Of Debt Held	30.00%
Secured Debt
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 500,000,000	$ 500,000,000
Debt Instrument, Interest Rate, Stated Percentage		4.625%
Debt Instrument, Covenant, Restricted Payments Allowable Pursuant To Certain Baskets, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum	2.00
Secured Debt | Prior to December 15, 2023
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	40.00%	40.00%
Redemption price related to net cash proceeds of certain equity offerings	104.625%
Debt Instrument, Redemption Price, Premium Applicable, Percentage	100.00%
2023 Senior Secured Notes
Debt Instrument [Line Items]
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums		$ 11,400,000
Debt Instrument, Event Of Default, Percentage Of Debt Held		30.00%
2023 Senior Secured Notes | Secured Debt
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 450,000,000	$ 0
Debt Instrument, Interest Rate, Stated Percentage		9.875%
Debt Instrument, Covenant, Restricted Payments Allowable Pursuant To Certain Baskets, Pro Forma Consolidated First Lien Net Leverage Ratio, Maximum		2.00
2023 Senior Secured Notes | Secured Debt | Prior to December 15, 2023
Debt Instrument [Line Items]
Redemption price related to net cash proceeds of certain equity offerings		109.875%
Debt Instrument, Redemption Price, Premium Applicable, Percentage		100.00%

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