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2.25% Convertible Senior Notes Due 2019 (Carrying Amounts of Liability and Equity Components - Additional Information) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Debt Instrument [Line Items]
Transaction costs related to the equity component	$ 1,177
2.25% Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		2.25%
2.25 % Convertible Senior Notes Due 2019 [Member] | 2.25% Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Remaining period over which the unamortized debt discount will be amortized	4 years

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Transaction Costs Allocated Between Liability And Equity Components

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- Definition

Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 470



-SubTopic 20



-Section 50



-Paragraph 5



-Subparagraph (a)



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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



-Section S99



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



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-Name Regulation S-X (SX)



-Number 210



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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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