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           EQUITY AND EARNINGS PER SHARE - Stock Issued In Public Offerings (Details) (USD $) 
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        1 Months Ended | 12 Months Ended | 103 Months Ended | 139 Months Ended | 1 Months Ended | 29 Months Ended | |||||||||||||||||||||||||||||||
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           Nov. 30, 2013 
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           Jun. 30, 2013 
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           Feb. 28, 2013 
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           Jan. 31, 2013 
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           Jul. 31, 2012 
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           May 31, 2012 
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           Apr. 30, 2012 
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           Sep. 30, 2011 
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           Mar. 31, 2011 
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           Dec. 31, 2013 
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           Dec. 31, 2012 
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           Dec. 31, 2011 
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           Dec. 31, 2010 
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           Dec. 31, 2013 
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           Nov. 30, 2013
 
          Manager 
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           Jun. 30, 2013
 
          Manager 
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           Feb. 28, 2013
 
          Manager 
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           Jan. 31, 2013
 
          Manager 
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           Jul. 31, 2012
 
          Manager 
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           May 31, 2012
 
          Manager 
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           Apr. 30, 2012
 
          Manager 
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           Sep. 30, 2011
 
          Manager 
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           Mar. 31, 2011
 
          Manager 
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           Dec. 31, 2013
 
          Manager 
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| Issuance of Common Stock, shares | 57,950,952 | 40,250,000 | 23,000,000 | 57,500,000 | 25,300,000 | 23,000,000 | 18,975,000 | 25,875,000 | 17,250,000 | 178,927,850 | 67,344,636 | 62,027,184 | 351,453,495 | 450,952 | 750,000 | 191,000 | 213,900 | 450,000 | 1,314,780 | [1] | |||||||||||||||||
| Issuance of Common Stock | $ 301,400,000 | $ 197,600,000 | $ 237,400,000 | $ 526,200,000 | $ 167,400,000 | $ 152,000,000 | $ 115,200,000 | $ 112,300,000 | $ 98,400,000 | $ 1,262,493,000 | $ 434,964,000 | $ 210,847,000 | |||||||||||||||||||||||||
| Share price | $ 5.21 | $ 4.92 | $ 10.34 | $ 9.35 | $ 6.63 | $ 6.71 | $ 6.22 | $ 4.55 | $ 6.00 | $ 5.25 | $ 4.97 | $ 10.48 | $ 9.35 | $ 6.70 | $ 4.55 | ||||||||||||||||||||||
| Options to purchase shares of common stock granted during the period | 5,795,095 | [2] | 4,025,000 | [2] | 2,300,000 | [2] | 5,750,000 | [2] | 2,530,000 | [2] | 2,300,000 | [2] | 1,897,500 | [2] | 2,587,500 | [2] | 1,725,000 | [2] | 32,433,822 | ||||||||||||||||||
| Exercise price of options granted | $ 5.25 | [2] | $ 4.97 | [2] | $ 10.48 | [2] | $ 9.35 | [2] | $ 6.70 | [2] | $ 6.71 | [2] | $ 6.22 | [2] | $ 4.55 | [2] | $ 6.00 | [2] | |||||||||||||||||||
| Fair Value at Date of Grant | $ 6,000 | [2] | $ 3,800 | [2] | $ 8,400 | [2] | $ 18,000 | [2] | $ 8,300 | [2] | $ 7,600 | [2] | $ 5,600 | [2] | $ 5,600 | [2] | $ 7,000 | [2] | |||||||||||||||||||
          
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