Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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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.

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Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Face (par) amount of debt instrument at time of issuance.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Convertible Notes (Schedule of Notes) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Aug. 16, 2013	Jul. 10, 2009	Jun. 29, 2009
Debt Instrument [Line Items]
Unamortized discount	$ (22,911)	$ (36,824)
Total convertible notes	115,089us-gaap_ConvertibleNotesPayable	273,676us-gaap_ConvertibleNotesPayable
Less current portion	0us-gaap_ConvertibleNotesPayableCurrent	164,047us-gaap_ConvertibleNotesPayableCurrent
Total long-term convertible notes	115,089us-gaap_ConvertibleLongTermNotesPayable	109,629us-gaap_ConvertibleLongTermNotesPayable
Convertible notes
Debt Instrument [Line Items]
Face Value	138,000	310,500
Convertible notes \| 1.125% Convertible Senior Notes due 2018
Debt Instrument [Line Items]
Face Value	138,000	138,000	138,000
Unamortized discount	(22,911)	(28,371)
Convertible notes \| 5% Convertible Senior Notes due 2014
Debt Instrument [Line Items]
Face Value	0	172,500		22,500	150,000
Unamortized discount	$ 0	$ (8,453)