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DEBT (Details 2) - USD ($) $ / shares in Units, shares in Thousands |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 13, 2017 | Jan. 23, 2013 | May 31, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Mar. 07, 2017
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |  |  |  |
Settlement period - convertible debt conversion request |  |  |  |  |  |  | 40 days |  |  |
Closing sale price (in dollars per share) |  |  |  |  | $ 32.05 |  | $ 32.05 |  |  |
Estimated conversion value |  |  |  |  | $ 100,000 |  | $ 100,000 |  |  |
Shares issued to settle the conversion premium |  |  | 10 | 2,500 |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  | $ 3,700,000 | 0 | $ 11,000 | 0 | $ 3,732,000 |  |
Repayments of debt |  |  |  |  |  |  | 0 | $ 118,191,000 |  |
Convertible Senior Notes Due 2022 |  |  |  |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |  |  |  |
Principal amount used for debt instrument conversion ratio |  |  |  |  | 1,000 |  | 1,000 |  |  |
Initial conversion rate of common stock per $1000 of principal amount of Notes (in shares) | 14.9491 |  |  |  |  |  |  |  |  |
Initial conversion price of notes into common stock (in dollars per share) | $ 66.89 | $ 66.89 |  |  |  |  |  |  |  |
Convertible debt, premium on common stock | 37.50% |  |  |  |  |  |  |  |  |
Closing sale price (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 48.65
Liability component of convertible debt | $ 274,100,000 |  |  |  |  |  |  |  |  |
Convertible debt, assumed borrowing rate | 7.45% |  |  |  |  |  |  |  |  |
Convertible debt, carrying amount of equity component | $ 70,900,000 |  |  |  |  |  |  |  |  |
Total transaction costs related to the issuance of Notes | $ 11,000,000 |  |  |  |  |  |  |  |  |
Debt issuance costs, amortization period | 5 years |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2022 | Conversion terms prior to close of business on business day immediately proceeding October 1, 2021 |  |  |  |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |  |  |  |
Convertible debt, common stock closing sales price minimum, number of trading days | 20 days |  |  |  |  |  |  |  |  |
Convertible debt, number of consecutive trading days | 30 days |  |  |  |  |  |  |  |  |
Convertible debt, common stock closing sales price minimum as percentage of conversion price | 130.00% |  |  |  |  |  |  |  |  |
Principal amount used for debt instrument conversion ratio |  |  |  |  | 1,000 |  | 1,000 |  |  |
Market price per $1000 of principal amount of notes |  |  |  |  | 934 |  | 934 |  |  |
Convertible Senior Notes Due 2022 | Debt Redemption Terms on or after April 1, 2020 |  |  |  |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |  |  |  |
Convertible debt, common stock closing sales price minimum, number of trading days | 20 days |  |  |  |  |  |  |  |  |
Convertible debt, number of consecutive trading days | 30 days |  |  |  |  |  |  |  |  |
Convertible debt, common stock closing sales price minimum as percentage of conversion price | 130.00% |  |  |  |  |  |  |  |  |
Convertible debt, number of trading days prior to date on which entity provides notice of redemption | 5 days |  |  |  |  |  |  |  |  |
Debt Instrument, Percentage of Principal Amount for Computation of Redemption Price | 100.00% |  |  |  |  |  |  |  |  |
Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |  |  |  |
Initial conversion price of notes into common stock (in dollars per share) |  | $ 24.82 |  |  |  |  |  |  |  |
Debt repurchased face amount |  |  |  | 117,700,000 | 500,000 |  | 500,000 |  |  |
Debt repurchase amount |  |  |  | $ 118,200,000 | 500,000 |  | 500,000 |  |  |
Repayments of debt |  |  |  |  |  |  | 300,000 |  |  |
Convertible Senior Notes Due 2019 | Conversion terms, prior to close of business on business day immediately preceding August 1, 2018 |  |  |  |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |  |  |  |
Principal amount used for debt instrument conversion ratio |  |  |  |  | 1,000 |  | 1,000 |  |  |
Market price per $1000 of principal amount of notes |  |  |  |  | 1,320 |  | 1,320 |  |  |
Estimated conversion value |  |  |  |  | 1,291 |  | 1,291 |  |  |
Unsecured Debt | Convertible Senior Notes Due 2022 |  |  |  |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |  |  |  |
Debt issued in private placement | $ 345,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 2.375% |  |  |  |  |  |  |  |  |
Net proceeds from issuance of convertible debt | $ 334,000,000 |  |  |  |  |  |  |  |  |
Convertible notes outstanding amount |  |  |  |  | $ 283,258,000 |  | $ 283,258,000 |  | $ 276,173,000 |
Unsecured Debt | Convertible Senior Notes Due 2019 |  |  |  |  |  |  |  |  |  |
DEBT AND FINANCING OBLIGATIONS |  |  |  |  |  |  |  |  |  |
Debt issued in private placement |  | $ 120,000,000 |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 3.25% |  |  | 3.25% |  | 3.25% |  |  |
Convertible notes outstanding amount |  |  |  |  | $ 330,000 |  | $ 330,000 |  | $ 324,000 |

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