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CONVERTIBLE NOTES (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Feb. 18, 2014 USD ($)	Dec. 31, 2015 USD ($) item $ / shares	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Convertible notes		$ 150,000	$ 150,000
Convertible notes
Debt Instrument [Line Items]
Proceeds from initial issuance of convertible notes	$ 130,000
Period of option for additional issuance	30 days
Proceeds from additional issuance of convertible notes	$ 20,000
Interest rate (as a percent)		4.25%
Conversion rate		22.2222
Conversion price (in dollars per share) | $ / shares		$ 45.00
Sales price of common stock as percentage of conversion price for redemption at Company's option		130.00%
Number of trading days that threshold percentage exceeds stock price for trigger of redemption at Company's option | item		20
Period of consecutive trading days that the threshold of trading days must fall within for trigger of redemption at Company's option		30 days
Redemption prices as percentage of outstanding principal amount plus accrued and unpaid interest following occurrence of certain tax related events		100.00%
Convertible notes		$ 150,000
Issuance costs		$ 5,103
Effective interest rate (as a percent)		4.98%
Amortization of financing costs		$ 810
Interest expense		6,375
Accrued interest		$ 2,387

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- Definition

The period of option available to initial purchasers of convertible debt instruments for purchase of additional convertible debt instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage price of original principal amount of debt plus accrued interest at which debt can be redeemed by the issuer following occurrence of certain tax related events.

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The cash inflow from the additional 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.

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The cash inflow from the initial 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.

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

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

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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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Amount of interest payable on debt, including, but not limited to, trade payables.

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