Annual report pursuant to Section 13 and 15(d)

ORGANIZATION - Common Stock Issued (Details)

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ORGANIZATION - Common Stock Issued (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended 127 Months Ended
Jan. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 07, 2014
Nov. 06, 2014
Feb. 14, 2014
Feb. 13, 2014
May. 16, 2013
May. 15, 2013
Class of Stock [Line Items]                      
Net Proceeds (millions)     $ 197.9 $ 1,262.6              
Issuance of common stock, shares 9,583,333 230,090 7,848,926 29,821,308 28,754,274            
Shares Issued, Price Per Share $ 56.10   $ 25.92                
Common stock, shares issued   66,654,598 66,424,508                
Share Price (in dollars per share)   $ 4.08       $ 4.00 $ 23.53 $ 29.88 $ 34.50 $ 34.74 $ 73.98
Lower Range                      
Class of Stock [Line Items]                      
Shares Issued, Price Per Share       $ 29.82              
Upper Range                      
Class of Stock [Line Items]                      
Shares Issued, Price Per Share       $ 62.88