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Debt - Components of Long-term Debt (Details) - USD ($)	Dec. 31, 2017	May 08, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 637,100,000
Other debt	21,300,000		$ 16,100,000
Total	644,700,000		300,000,000
Less – current maturities	10,800,000		106,000,000
Total long-term debt	$ 633,900,000		194,000,000
5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Aggregate principal amount			1,000
Senior Notes | 10.75% senior secured notes due April 15, 2022
Debt Instrument [Line Items]
Interest rate	10.75%
Long-term debt	$ 429,600,000		$ 0
Aggregate principal amount	440,000,000.0
Debt Instrument, Unamortized Discount	$ 10,400,000.0
Senior Notes | 5.50% convertible senior notes due March 1, 2021
Debt Instrument [Line Items]
Interest rate	5.50%		5.50%
Long-term debt	$ 186,300,000		$ 179,100,000
Aggregate principal amount	213,500,000.0		213,500,000.0
Debt Instrument, Unamortized Discount	$ 27,200,000.0		34,400,000.0
Senior Notes | 6.25% senior notes due August 15, 2017
Debt Instrument [Line Items]
Interest rate	6.25%	6.25%
Long-term debt	$ 0		94,700,000
Capital Lease Obligations
Debt Instrument [Line Items]
Capital leases	$ 7,500,000		$ 10,100,000

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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 and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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

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