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Debt - Components of Long-term Debt (Details) - USD ($)	Dec. 31, 2020	Oct. 29, 2020	Apr. 15, 2020	Dec. 31, 2019	Aug. 06, 2019	Dec. 31, 2016
Debt Instrument [Line Items]
Finance leases	$ 5,500,000			$ 5,300,000
Other debt	63,900,000			59,600,000
Total	629,900,000			579,400,000
Less – current maturities	102,800,000			13,500,000
Total long-term debt	$ 527,100,000			565,900,000
Senior Notes | 6.875% senior secured notes due November 1, 2027
Debt Instrument [Line Items]
Interest rate	6.875%	6.875%
Face value	$ 485,000,000.0	$ 485,000,000.0
Unamortized discount and issuance costs	8,100,000
Long-term debt	$ 476,900,000			0
Senior Notes | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%					5.50%
Face value	$ 84,200,000			84,200,000		$ 213,500,000
Unamortized discount and issuance costs	600,000			4,200,000
Long-term debt	$ 83,600,000			$ 80,000,000.0	$ 84,200,000
Senior Notes | 10.75% senior secured notes
Debt Instrument [Line Items]
Interest rate	10.75%		10.75%	10.75%
Face value				$ 440,000,000.0
Unamortized discount and issuance costs				5,500,000
Long-term debt	$ 0			$ 434,500,000

X

- Definition

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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- Definition

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

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- Definition

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

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, including portion classified as current.

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