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Convertible Notes (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Interest expense related to notes
Amortization of discount and debt issuance costs			$ 3,140	$ 11,711
Interest expense	$ 3,091	$ 8,770	6,174	18,696
Convertible Senior Notes
Interest expense related to notes
Interest expense	1,969	7,630	3,931	16,416
Convertible Senior Notes | 5% Convertible Senior Notes due 2014
Interest expense related to notes
Interest	0	1,773	0	3,929
Amortization of discount and debt issuance costs	$ 0	$ 3,975	$ 0	$ 8,744
Convertible notes stated interest rate (as a percent)	5.00%		5.00%		5.00%
Additional Effective Interest Rate	0.00%	11.70%	0.00%	11.70%
Convertible Senior Notes | 1.125% Convertible Senior Notes due 2018
Interest expense related to notes
Interest	$ 388	$ 388	$ 791	$ 776
Amortization of discount and debt issuance costs	$ 1,581	$ 1,494	$ 3,140	$ 2,967
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%

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

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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.

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

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

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

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