Debt Obligations - (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Dec. 31, 2012	Jul. 25, 2011
Debt Obligations [Abstract]
Debt Instrument, Interest Rate, Stated Percentage			3.75%
Convertible Preferred Stock, Shares Issued upon Conversion			77.241
Note increment for which conversion amount of Common Stock based			$ 1,000
Debt Instrument, Convertible, Conversion Price			$ 12.95
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 17.00
Proceeds from Convertible Debt	50,249
Convertible Debt	60,000	60,000	60,000
Debt Instrument, Unamortized Discount	10,323	10,990
Convertible senior notes	49,677	49,010
Contractual Interest Coupon	562
Amortization of Debt Discount (Premium)	667
Amortization of Financing Costs	72
Interest Expense, Debt	$ 1,301

Contractual Interest Coupon

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- Definition

Principal Amount of Note

+ References

No definition available.

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- Definition

strike price of the warrant will initially be per share

+ References

No definition available.

+ Details

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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- Definition

Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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-Name Regulation S-X (SX)

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- Definition

Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

+ References

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- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

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- Definition

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

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

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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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- Definition

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

+ References

+ Details

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Glossary Financing Activities

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