The percentage above the last reported sale price of the Company's common stock.

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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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Face (par) amount of debt instrument at time of issuance.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount, after accumulated amortization, of debt discount.

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

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No definition available.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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DEBT - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Aug. 07, 2017 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares	Aug. 01, 2017 $ / shares
Debt
Value of shares repurchased and retired		$ 97,500	$ 78,094	$ 25,636
Common Stock
Debt
Share Price \| $ / shares					$ 13.28
Number of shares repurchased and retired \| shares		7,430,000	7,201,000	2,676,000
Value of shares repurchased and retired		$ 75	$ 72	$ 27
2025 Notes
Debt
debt discount		$ 67,300
Convertible senior notes \| 2025 Notes \| Over-Allotment Option
Debt
Loan amount	$ 17,500
Convertible senior notes \| 2025 Notes \| Private Placement
Debt
Loan amount	$ 192,500
Interest rate (as a percent)	2.50%
Convertible senior notes \| 2025 Notes \| Common Stock
Debt
Conversion rate	57.9240
Conversion price (dollars per share) \| $ / shares	$ 17.26	$ 17.26
Conversion premium (as a percent)	30.00%
Number of shares repurchased and retired \| shares	1,317,771
Value of shares repurchased and retired	$ 17,500