Percentage of Expired Warrants

No definition available.

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- Definition

Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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- Definition

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

+ References

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- Definition

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.

+ References

No definition available.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Amount of cash paid for interest, including, but not limited to, capitalized interest and payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount; classified as operating and investing activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Debt and Credit Arrangements - 2018 (Details) - USD ($)		3 Months Ended	12 Months Ended
Debt and Credit Arrangements - 2018 (Details) - USD ($)	Aug. 01, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017
Debt Instrument
Loss on extinguishment of debt			$ 0	$ 4,900,000	$ 0
Senior Secured Revolving Credit Facility, due 2022 \| Revolving Credit Facility
Debt Instrument
Write off of unamortized debt issuance costs				200,000
Convertible Debt \| Convertible Notes, due 2018
Debt Instrument
Debt instrument stated interest rate (percent)	2.00%					2.00%
Principal amount	$ 57,100,000.0	$ 57,100,000	0	57,100,000		$ 250,000,000
Repayments of debt	57,100,000
Interest paid	$ 600,000
Write off of unamortized debt issuance costs			0	400,000	0
Loss on extinguishment of debt		$ 4,900,000	$ 0	$ 4,700,000	$ 0
Percentage of expired warrants (percent)			90.00%
Debt instrument strike price (usd per share)			$ 84.96