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Convertible Notes (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Aug. 16, 2013	Dec. 31, 2012
Interest expense related to notes
Amortization of discount and debt issuance costs			$ 13,369	$ 10,856
Interest expense	8,552	7,121	23,290	20,420
Convertible Senior Notes [Member]
Interest expense related to notes
Interest expense	7,485	5,945	20,032	17,325
Convertible Senior Notes [Member] | 5% Convertible Senior Notes due 2014
Debt Instrument [Line Items]
Additional Effective Interest Rate	11.70%		11.70%			11.70%
Interest expense related to notes
Interest	2,156	2,156	6,469	6,469
Amortization of discount and debt issuance costs	4,416	3,789	12,650	10,856
Convertible notes stated interest rate (as a percent)	5.00%		5.00%			5.00%
Convertible Senior Notes [Member] | 1.125% Convertible Senior Notes due 2018
Debt Instrument [Line Items]
Additional Effective Interest Rate	5.50%		5.50%			5.50%
Interest expense related to notes
Interest	194	0	194	0
Amortization of discount and debt issuance costs	$ 719	$ 0	$ 719	$ 0
Convertible notes stated interest rate (as a percent)	1.125%		1.125%		1.125%

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- Definition

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

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No definition available.

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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

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-SubTopic 10

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Interest rate stated in the contractual debt agreement.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

The cost of borrowed funds accounted for as interest that was charged against earnings during the period.

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-Name Statement of Financial Accounting Standard (FAS)

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings.

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