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STOCKHOLDERS' EQUITY (Details) (USD $) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Apr. 30, 2010
Stockholders' Equity |  |  |  |  |
Maximum value of securities for which the entity filed a shelf registration statement |  |  | $ 200,000,000 |  | $ 150,000,000
Common stock issued (in shares) | 7,813,483 | 21,613,483 | 12,075,000 | 11,500,000 |
Net proceeds from sale of common stock |  | 295,697,000 | 83,784,000 | 36,023,000 |
Net proceeds from sale of stock in an underwritten public offering |  | 278,563,000 | 43,483,000 | 33,695,000 |
Preferred stock, shares authorized | 3,000,000 | 3,000,000 | 3,000,000 |  |
Class C Preferred Stock |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Preferred stock, shares authorized | 3,000,000 | 3,000,000 |  |  |
Series C-1 Preferred Stock |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Preferred stock, shares authorized | 350,000 | 350,000 |  |  |
Cantor Amendment |  |  |  |  |
Stockholders' Equity |  |  |  |  |
Common stock issued (in shares) |  | 2,433,608 | 8,003,290 | 575,000 |
Net proceeds from sale of common stock |  | $ 17,100,000 | $ 40,100,000 | $ 2,200,000 |
Shareholder Rights Plan |  |  |  |  |
Shareholder Rights Plan |  |  |  |  |
Number of multiples of the exercise price that the Right holder has a right to receive in value of the acquiring company's common stock |  | 2 |  |  |
Shareholder Rights Plan | Minimum |  |  |  |  |
Shareholder Rights Plan |  |  |  |  |
Percentage of assets or earning power sold allowing the Right holder a right to receive common stock of the acquiring company |  | 50.00% |  |  |
Shareholder Rights Plan | Series C-1 Preferred Stock |  |  |  |  |
Shareholder Rights Plan |  |  |  |  |
Number of preferred stock purchase rights for each outstanding share of common stock |  | 1 |  |  |
Number of shares callable by rights | 0.0001 | 0.0001 |  |  |
Exercise price (in dollars per unit) | 35.00 | 35.00 |  |  |
Number of multiples of the exercise price that the Right holder has right to receive in value if 15% or more of the outstanding common stock is acquired |  | 2 |  |  |
Shareholder Rights Plan | Series C-1 Preferred Stock | Minimum |  |  |  |  |
Shareholder Rights Plan |  |  |  |  |
Percentage of common stock to be acquired for rights to be exercisable |  | 15.00% |  |  |
Percentage of common stock to be acquired in a tender offer for rights to be exercisable |  | 15.00% |  |  |

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