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Debt - Components of Long-term Debt (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Oct. 29, 2020	Dec. 31, 2019	Dec. 31, 2016
Debt Instrument [Line Items]
Finance leases	$ 2,700,000	$ 5,500,000
Other debt	48,600,000	63,900,000
Total	529,400,000	629,900,000
Less – current maturities	18,200,000	102,800,000
Total long-term debt	$ 511,200,000	527,100,000
Senior Notes | Senior Secured Notes Due 2027
Debt Instrument [Line Items]
Stated interest rate (as a percentage)	6.875%
Face amount	$ 485,000,000	485,000,000	$ 485,000,000
Unamortized discount and fees	6,900,000	8,100,000
Long-term debt, gross	478,100,000	$ 476,900,000
Senior Notes | Convertible Senior Notes Due 2021
Debt Instrument [Line Items]
Stated interest rate (as a percentage)		5.50%
Face amount					$ 213,500,000
Unamortized discount and fees		$ 600,000
Long-term debt, gross	$ 0	$ 83,600,000		$ 84,200,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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