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Notes Payable Level 4 (Details) (USD $)	3 Months Ended		9 Months Ended			12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Convertible Debt Issued in 2010 [Member]	Dec. 31, 2011 Convertible Debt Issued in 2010 [Member]	Sep. 30, 2012 Convertible Debt Issued in 2009 [Member]	Dec. 31, 2011 Convertible Debt Issued in 2009 [Member]	Sep. 30, 2012 Convertible Debt Issued in 2004 [Member]	Dec. 31, 2011 Convertible Debt Issued in 2004 [Member]	Sep. 30, 2012 Convertible Debt Issued 2009 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage					8.90%				8.50%		11.90%
Debt Instrument, Convertible, Interest Expense	$ 7,100,000	$ 8,000,000	$ 21,200,000	$ 23,700,000
Long-term Debt, Gross					200,000,000	200,000,000	115,839,000	115,839,000	28,243,000	28,243,000
Debt Instrument, Unamortized Discount					(23,736,000)	(28,906,000)	(13,650,000)	(17,568,000)	0	0
Convertible Debt					176,264,000	171,094,000	102,189,000	98,271,000	28,243,000	28,243,000
Debt Instrument, Convertible, Carrying Amount of Equity Component							15,586,000	15,586,000	22,637,000	22,637,000
Debt Instrument, Convertible, If-converted Value in Excess of Principal					$ 0	$ 0	$ 23,193,000	$ 8,489,000	$ 0	$ 0
Debt Instrument, Convertible, Conversion Price							$ 9.69		$ 14.03

X

- Definition

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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X

- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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-Topic 210

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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- Definition

Interest expense related to convertible debt instruments which has been recognized for the period, including the contractual interest coupon and amortization of the debt discount, if any.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Publisher SEC

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- Definition

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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