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Convertible Notes (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Aug. 16, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Convertible notes, short-term	$ 159,731		$ 0
Convertible notes, long-term	108,316		147,556
Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Principal amount of convertible notes	310,500		172,500
Unamortized discount	(42,453)		(24,944)
Total convertible notes	268,047		147,556
Convertible notes, short-term	159,731		0
Convertible notes, long-term	108,316		147,556
Convertible Senior Notes [Member] | 5% Convertible Senior Notes due 2014
Debt Instrument [Line Items]
Convertible notes stated interest rate (as a percent)	5.00%		5.00%
Principal amount of convertible notes	172,500		172,500
Unamortized discount	(12,769)		(24,944)
Convertible Senior Notes [Member] | 1.125% Convertible Senior Notes due 2018
Debt Instrument [Line Items]
Convertible notes stated interest rate (as a percent)	1.125%	1.125%
Principal amount of convertible notes	138,000	138,000	0
Unamortized discount	$ (29,684)		$ 0

X

- Definition

Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ 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



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-Section 02

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X

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

+ References

Reference 1: 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)

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-Publisher FASB

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-Topic 944

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- Definition

Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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-Publisher FASB

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Interest rate stated in the contractual debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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