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Notes Payable Level 4 (Details) (USD $)	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Convertible Debt Issued in 2010 [Member]	Dec. 31, 2012 Convertible Debt Issued in 2010 [Member]	Jun. 30, 2013 Convertible Debt Issued in 2009 [Member]	Dec. 31, 2012 Convertible Debt Issued in 2009 [Member]	Jun. 30, 2013 Convertible Debt Issued in 2004 [Member]	Dec. 31, 2012 Convertible Debt Issued in 2004 [Member]	Jun. 30, 2013 Convertible Debt Issued 2009 [Member]	Jun. 30, 2013 Line of Credit 2011 [Member]	Dec. 31, 2012 Line of Credit 2011 [Member]
Debt Instrument [Line Items]
Debt Conversion, Converted Instrument, Shares Issued			216,729	0					216,729
Debt Instrument, Interest Rate, Effective Percentage					8.90%						11.90%
Line of Credit Facility, Amount Outstanding												$ 15,000,000	$ 0
Debt Instrument, Convertible, Interest Expense	6,800,000	7,100,000	14,000,000	14,100,000
Principal Amount of Convertible Senior Notes Payable at Issuance					200,000,000
Long-term Debt, Gross						200,000,000	115,839,000	115,839,000		28,243,000
Debt Instrument, Unamortized Discount					(18,285,000)	(21,944,000)	(9,428,000)	(12,269,000)		0
Convertible Debt					181,715,000	178,056,000	106,411,000	103,570,000		28,243,000
Debt Instrument, Convertible, Carrying Amount of Equity Component							15,586,000	15,586,000		22,637,000
Debt Instrument, Convertible, If-converted Value in Excess of Principal					$ 54,179,000	$ 0	$ 77,831,000	$ 30,382,000		$ 0
Debt Instrument, Convertible, Conversion Price							$ 9.57

X

- Definition

The principal amount of convertible senior notes payable at the time the securities were issued.

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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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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

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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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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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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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Amount borrowed under the credit facility as of the balance sheet date.

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