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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 |  |  |  |

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