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Debt - Components of Long-term Debt (Details) - USD ($)	Dec. 31, 2019	Aug. 06, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 574,300,000
Finance leases	5,300,000
Finance leases			$ 5,800,000
Other debt	59,800,000		20,800,000
Total	579,600,000		652,800,000
Less – current maturities	13,500,000		10,000,000.0
Total long-term debt	$ 566,100,000		642,800,000
5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Face value					$ 1,000
Senior Notes | 10.75% senior secured notes due April 15, 2022
Debt Instrument [Line Items]
Interest rate	10.75%			10.75%
Face value	$ 440,000,000.0		440,000,000.0	$ 440,000,000.0
Unamortized discount and fees	5,500,000.0		8,000,000
Long-term debt	$ 434,500,000		432,000,000.0
Senior Notes | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%				5.50%
Face value	$ 84,200,000.0		213,500,000.0		$ 213,500,000
Unamortized discount and fees	4,200,000.0		19,300,000.0
Long-term debt	$ 80,000,000.0	$ 84,200,000	$ 194,200,000

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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

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