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Fair Value of Financial Instruments (Details 2) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Convertible Senior Notes
Debt Instrument [Line Items]
Convertible Notes Payable	$ 117,949	$ 115,089
5% Convertible Senior Notes due 2014 | Convertible Senior Notes
Debt Instrument [Line Items]
Convertible notes stated interest rate (as a percent)	5.00%	5.00%
1.125% Convertible Senior Notes due 2018
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 138,000
1.125% Convertible Senior Notes due 2018 | Convertible Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Face Amount	138,000	$ 138,000
Convertible Notes Payable	117,949	115,089
Convertible Debt, Fair Value Disclosures	$ 189,060	$ 159,293
Convertible notes stated interest rate (as a percent)	1.125%	1.125%

X

- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Convertible Security



-URI http://asc.fasb.org/extlink&oid=6509036

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- 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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- 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=34725769&loc=d3e28878-108400



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- Definition

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

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



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-Paragraph 1



-Subparagraph (SX 210.5-02.22(a)(1))



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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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.

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