Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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-SubTopic 10
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-Paragraph 1
-Subparagraph (SX 210.5-02(30)(a)(1))
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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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-Section 55
-Paragraph 8
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- Definition

The average effective interest rate during the reporting period.

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-Publisher FASB
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- Definition

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

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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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Long-term Debt - Convertible Senior Notes Due 2024 (Details)	1 Months Ended	3 Months Ended
	Jul. 31, 2017 USD ($) day $ / shares	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Principal amount		$ 513,647,000
Additional paid-in capital		400,081,000	$ 397,927,000	$ 351,110,000
2024 Convertible Notes
Debt Instrument [Line Items]
Stated interest rate	2.875%
Principal amount	$ 143,750,000
Common Stock Class A Non-voting \| 2024 Convertible Notes
Debt Instrument [Line Items]
Conversion rate per $1000 principal amount	100
Conversion price, per share (in dollars per share) \| $ / shares	$ 10.00
2019 Convertible Notes Embedded Derivative — Level 2
Debt Instrument [Line Items]
Additional paid-in capital		25,300,000
Senior Notes \| 2024 Convertible Notes
Debt Instrument [Line Items]
Principal amount		$ 143,750,000
Effective interest rate		9.00%
Holder Option \| Senior Notes \| Common Stock Class A Non-voting \| 2024 Convertible Notes
Debt Instrument [Line Items]
Trading days \| day	20
Consecutive trading days \| day	30