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CONVERTIBLE SENIOR NOTES (Details) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 27, 2010 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Convertible senior notes |  |  |  |  |  |
Net carrying amount of the liability component |  | $ 113,306,000 |  | $ 113,306,000 |  |
Net carrying amount of the liability component |  |  |  |  |  | 110,918,000
Non-cash interest expense recognized |  |  |  | 2,388,000 | 2,188,000 |
Non-cash deferred financing amortization costs included in interest expense |  | 1,856,000 | 979,000 | 3,691,000 | 1,959,000 |
5.00% convertible senior notes |  |  |  |  |  |
Convertible senior notes |  |  |  |  |  |
Interest rate on convertible senior notes (as a percent) |  | 5.00% |  | 5.00% |  |
Notes issued | 125,000,000 |  |  |  |  |
Carrying amount of the equity component (additional paid-in capital) |  | 24,375,000 |  | 24,375,000 |  | 24,375,000
Principal amount of the 2010 Notes |  | 125,000,000 |  | 125,000,000 |  | 125,000,000
Unamortized discount of the liability component |  | 11,694,000 |  | 11,694,000 |  | 14,082,000
Net carrying amount of the liability component |  | 113,306,000 |  | 113,306,000 |  |
Net carrying amount of the liability component |  |  |  |  |  | 110,918,000
Effective interest rate on liability component (as a percent) |  | 10.00% | 10.00% | 10.00% | 10.00% |
Cash interest expense recognized |  | 1,571,000 | 1,554,000 | 3,112,000 | 3,116,000 |
Non-cash interest expense recognized |  | 1,209,000 | 1,097,000 | 2,388,000 | 2,188,000 |
Non-cash deferred financing amortization costs included in interest expense |  | 179,000 | 179,000 | 356,000 | 359,000 |
Remaining period over which the unamortized discount will be recognized |  |  |  | 2 years 1 month 17 days |  |
Non-payment of minimum indebtedness at final maturity for default |  | $ 50,000,000 |  | $ 50,000,000 |  |

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