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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (SX 210.5-02.22(a)(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

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

+ 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(a)(1))
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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

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

No definition available.

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Convertible Senior Notes, Warrants, and Hedges - Offering (Details)			3 Months Ended		9 Months Ended
	Nov. 04, 2015 $ / shares	Nov. 03, 2015 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)	Apr. 03, 2016 USD ($)	Oct. 29, 2015 USD ($)
Debt Instrument [Line Items]
Conversion ratio on convertible debt	0.029892
Convertible debt
Debt Instrument [Line Items]
Contractual interest expense			$ 1,600,000	$ 1,600,000	$ 3,300,000	$ 3,400,000
Convertible debt \| 0.875% Convertible Senior Notes Due 2022
Debt Instrument [Line Items]
Principal amount of debt		$ 48,800,000.0					$ 373,800,000.0	$ 325,000,000
Interest rate			0.875%		0.875%			0.875%
Convertible Notes, net		$ 363,445,000
Stock price trigger to convert convertible debt (in dollars per share) \| $ / shares	$ 33.45
Contractual interest expense			$ 827,000	$ 836,000	$ 2,480,000	$ 2,480,000