Financing Arrangements and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 217,484	$ 183,118
Unamortized discount and debt issuance costs	(20,264)	(22,643)
Long-term debt	197,220	160,475
Long-term debt, current maturities, gross	(3,584)	(1,518)
Unamortized discount and debt issuance costs, current	0	0
Long-term debt, current maturities	(3,584)	(1,518)
Long-term debt, excluding current maturities, gross	213,900	181,600
Unamortized discount and debt issuance costs, noncurrent	(20,264)	(22,643)
Long-term debt, excluding current maturities	193,636	158,957
Other Debt
Debt Instrument [Line Items]
Long-term debt, gross	3,584	1,518
Long-term debt	3,584	1,518
Senior notes \| Convertible Notes due 2021
Debt Instrument [Line Items]
Long-term debt, gross	100,000	100,000
Unamortized discount and debt issuance costs	(20,264)	(22,643)
Long-term debt	79,736	77,357
Revolving credit facility \| ABL Facility
Debt Instrument [Line Items]
Long-term debt, gross	113,900	81,600
Long-term debt	$ 113,900	$ 81,600

Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Current

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- Definition

Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Noncurrent

+ References

No definition available.

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- Definition

Long-term Debt, Current Maturities, Gross

+ References

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- Definition

Long-term Debt, Excluding Current Maturities, Gross

+ References

No definition available.

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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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