Debt Instrument Convertible Measurement Period

No definition available.

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- Definition

Debt Instrument Convertible Measurement Period Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument Debt Default Description Of Violation Or Event Of Default Amount

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Debt Instrument Debt Default Description Of Violation Or Event Of Default Final Judgment Payment Period

+ References

No definition available.

+ Details

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- Definition

Debt Instrument Debt Default Description Of Violation Or Event Of Default Percentage Of Amount Due

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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Period Type:	duration

- Definition

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.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ Details

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Balance Type:	na
Period Type:	duration

- 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
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	na
Period Type:	instant

- 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.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow from the repayment of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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Balance Type:	credit
Period Type:	duration

- Details

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- Details

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- Details

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Subsequent Events (Details)							12 Months Ended
Subsequent Events (Details)	Feb. 10, 2020 USD ($)	Feb. 10, 2020 USD ($) shares	Feb. 10, 2020 USD ($) trading_day	Feb. 10, 2020 USD ($)	Feb. 10, 2020 USD ($) business_day	Apr. 15, 2019 USD ($) business_day	Dec. 31, 2019 USD ($) trading_day	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) business_day
Debt Instrument [Line Items]
Description of event of default, aggregate principal amount of final judgments						$ 10,000,000
Description of event of default, final judgment payment period \| business_day						60
Percentage of principal amount due if event of default occurs (at least)						25.00%
Convertible Debt
Debt Instrument [Line Items]
Debt issued						$ 80,000,000.0	$ 80,000,000	$ 80,000,000	$ 80,000,000
Convertible Debt \| Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Stated interest rate						4.50%
Trading days \| trading_day							20
Consecutive trading days \| business_day									30
Convertible debt, measurement period							5		5
Convertible debt, measurement period percentage								98.00%
Convertible Debt \| Subsequent event \| Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Debt issued	$ 120,000,000	$ 120,000,000	$ 120,000,000	$ 120,000,000	$ 120,000,000
Stated interest rate	2.875%	2.875%	2.875%	2.875%	2.875%
Net proceeds from issuance and sale of notes	$ 115,900,000
Trading days \| trading_day			20
Consecutive trading days \| business_day					30
Percentage of conversion price				130.00%
Convertible debt, measurement period			5		5
Convertible debt, measurement period percentage				98.00%
Description of event of default, aggregate principal amount of final judgments	15,000,000.0
Description of event of default, final judgment payment period \| business_day					60
Percentage of principal amount due if event of default occurs (at least)				25.00%
Convertible Debt \| Subsequent event \| Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Debt issued	13,750,000.00	$ 13,750,000.00	$ 13,750,000.00	$ 13,750,000.00	$ 13,750,000.00
Repayments of convertible debt	66,250,000
Number of shares of common stock used to repurchase (in shares) \| shares		722,423
Common stock to repurchased	$ 66,250,000	$ 66,250,000	$ 66,250,000	$ 66,250,000	$ 66,250,000