Convertible Notes, Equity Component [Abstract]

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- Definition

Convertible Notes, Liability Component [Abstract]

+ References

No definition available.

+ Details

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- Definition

Debt Instrument, Convertible, Allocated Amount of Equity Component

+ References

No definition available.

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- Definition

Debt Instrument, Convertible, Equity Component, Issuance Cost

+ References

No definition available.

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- Definition

Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

+ References

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031897-161870

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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Convertible Senior Notes, Warrants, and Hedges - Components (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Apr. 02, 2017	Nov. 03, 2015
Liability component
Outstanding principal, net of unamortized debt issuance costs	$ 295,983	$ 285,541
Convertible debt \| 0.875% Convertible Senior Notes Due 2022
Liability component
Principal			$ 274,435
Less: Issuance cost			(7,568)
Outstanding principal, net of unamortized debt issuance costs	$ 295,983	$ 285,541	266,867
Equity component
Allocated amount			99,316
Less: Issuance cost			(2,738)
Net carrying amount			$ 96,578