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Convertible Notes (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Interest expense related to notes
Amortization of discount and debt issuance costs			$ 13,226	$ 13,369
Interest expense	3,059	8,552	21,755	23,290
Convertible Senior Notes
Interest expense related to notes
Interest expense	1,918	7,485	18,334	20,032
Convertible Senior Notes | 5% Convertible Senior Notes due 2014
Interest expense related to notes
Interest	0	2,156	3,929	6,469
Amortization of discount and debt issuance costs	0	4,416	8,744	12,650
Convertible notes stated interest rate (as a percent)	5.00%		5.00%		5.00%
Additional Effective Interest Rate	11.70%	11.70%	11.70%	11.70%
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018
Interest expense related to notes
Interest	403	194	1,179	194
Amortization of discount and debt issuance costs	$ 1,515	$ 719	$ 4,482	$ 719
Convertible notes stated interest rate (as a percent)	1.125%		1.125%		1.125%
Additional Effective Interest Rate	5.50%	5.50%	5.50%	5.50%

X

- Definition

Additional effective interest rate for the funds borrowed under the debt agreement considering original issue discount and issuance costs.

+ References

No definition available.

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- Definition

Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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-Section S99

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

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391



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-Name Accounting Standards Codification

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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