Represents the amortization period of financing costs.

No definition available.

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- Definition

Represents the portion of debt issuance costs allocated to the equity component of the convertible debt.

+ References

No definition available.

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Represents the portion of debt issuance costs allocated to the liability component of the convertible debt.

+ References

No definition available.

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Represents the percentage of premium added to the last reported sale price of the common stock of the entity to arrive at the conversion price of the debt instrument.

+ References

No definition available.

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Represents the percentage of principal amount at which holders of the debt instruments may force the entity to repurchase the debt instruments prior to maturity. The repurchase price also include accrued and unpaid interest up to the fundamental change repurchase date.

+ References

No definition available.

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- Definition

Represents the principal amount of notes used as a denominator for purposes of computing the conversion ratio of convertible debt.

+ References

No definition available.

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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.

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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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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Fair value of convertible debt at the balance sheet date.

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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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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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The ratio applied to the debt for purposes of determining the number of shares of the equity security into which the debt will be converted.

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The effective interest rate on the liability component of convertible debt instrument which may be settled in cash upon conversion, including partial cash settlement.

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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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Increase of additional borrowings on existing and new debt instruments.

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Interest rate stated in the contractual debt agreement.

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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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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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Price of a single share of a number of saleable stocks of a company.

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CONVERTIBLE SENIOR NOTES (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended					0 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 28, 2012	Jul. 27, 2010	Jul. 27, 2010 5.00% convertible senior notes	Dec. 31, 2012 5.00% convertible senior notes	Dec. 31, 2011 5.00% convertible senior notes	Dec. 31, 2010 5.00% convertible senior notes
Convertible senior notes
2010 Notes issued						$ 125,000
Interest rate on convertible notes (as a percent)						5.00%	5.00%
Conversion rate of common stock per $1000 of principal amount of convertible notes (in shares)						51.0204
Principal amount used for debt instrument conversion ratio						1,000
Initial conversion price of convertible notes into common stock (in dollars per share)						$ 19.60
Premium on sale price to calculate exchange price of notes (as a percent)						22.50%
Offering price of common stock (in dollars per share)				$ 7.10	$ 16.00
Number of shares to be converted into common stock						6,377,551
Interest rate assumed for estimating fair value of the liability component (as a percent)						10.00%
Estimated fair value of liability component						100,625
Estimated fair value of conversion option						24,375	24,375	24,375
Issuance costs allocated to equity component						918
Issuance costs allocated to liability component						3,637
Amortization period of debt issuance costs						5 years
Percentage of principal amount at which the note may be repurchased prior to the maturity date of note						100.00%
Carrying amount of the equity component (additional paid-in capital)						24,375	24,375	24,375
Principal amount of the 2010 Notes							125,000	125,000
Unamortized discount of the liability component							14,082	18,619
Net carrying amount of the liability component	110,918	106,381					110,918	106,381
Effective interest rate on liability component (as a percent)							10.00%	10.00%	10.00%
Cash interest expense recognized							6,263	6,231	2,662
Non-cash interest expense recognized	4,537	4,072	1,684				4,537	4,072	1,684
Non-cash deferred financing amortization costs included in interest expense	$ 5,413	$ 3,188	$ 1,967				$ 722	$ 720	$ 311
Remaining period over which the unamortized discount will be recognized							2 years 7 months 6 days