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CONVERTIBLE NOTES PAYABLE (Details) (USD $) | 0 Months Ended | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | ---
Dec. 20, 2011 | Dec. 31, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 20, 2011 | Jan. 31, 2007
Convertible Notes Payable [Abstract] |  |  |  |  |  |  |
Redemption of convertible notes payable |  | $ 0 |  | $ (48,997,000) | $ (240,000) |  |
Gains (Losses) on Extinguishment of Debt |  | (198,000) |  | 1,268,000 | 0 |  |
Convertible Notes Payable |  | 930,000 | 930,000 | 930,000 |  |  |
Convertible Notes Payable [Member] |  |  |  |  |  |  |
Convertible Notes Payable [Abstract] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | 115,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 3.75%
Debt Instrument, Convertible, Effective Interest Rate |  | 6.03% |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  | $ 29.26 | $ 29.26 |  |  |  | $ 30.86
Common Shares Trading Price, Percentage of Conversion Price For Prior to Maturity Conversion |  | 130.00% |  |  |  |  |
Measurement Period, Conversion Prior to Maturity |  | 20 days |  |  |  |  |
Consecutive Trading Period |  | 30 days |  |  |  |  |
Redemption Price, Percentage of Principal Amount Plus Accrued and Unpaid Interest |  |  | 100.00% |  |  |  |
Required Repurchase Price, Percentage of Principal Amount Plus Accrued and Unpaid Interest | 100.00% |  |  |  |  | 100.00% |
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments |  |  |  |  |  | 11,300,000 |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  |  | 1,100,000 |  |
Interest expense relating to contractual interest coupon |  | 0 |  | 1,500,000 | 1,900,000 |  |
Additional non-cash interest expense |  |  |  | 800,000 | 1,000,000 |  |
Redemption of convertible notes payable | 24,000,000 | 114,100,000 |  | 48,800,000 |  |  |
Purchase of Convertible Notes Payable, Average Discount Rate |  | 11.00% | 11.00% |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  | $ (400,000) |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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