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CONVERTIBLE NOTES (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Feb. 18, 2014 USD ($)	Dec. 31, 2017 USD ($) D item $ / shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Gain on repurchase of convertible notes			$ 2,782
Convertible notes		$ 126,476	125,569
2014 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 | D		30
Redemption prices as percentage of outstanding principal amount plus accrued and unpaid interest following occurrence of certain tax related events		100.00%
Convertible notes		$ 126,476	125,569
Unamortized issuance costs		$ 1,024	1,931
Effective interest rate (as a percent)		4.96%
Amortization of financing costs		$ 907	898	$ 810
Interest expense		5,419	5,642
2014 Notes | Other payables
Debt Instrument [Line Items]
Accrued interest		$ 2,008	$ 2,008

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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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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 instrument must exceed threshold percentage for specified number of trading days 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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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

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