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Basis of Presentation (Tables)
9 Months Ended
Sep. 30, 2013
Business and Basis of Presentation  
Schedule of Error Corrections and Prior Period Adjustments
                   
  Net Cash (Used in) Provided by Operating Activities Net Cash Provided by (Used in) Financing Activities
  As Reported Adjustment As Revised As Reported Adjustment As Revised
 (in thousands) (in thousands)
Six months ended June 30, 2013$ (6,116) $ 673 $ (5,443) $ 388,748 $ (673) $ 388,075
Three months ended March 31, 2013  (319)   275   (44)   144,894   (275)   144,619
                  
Year ended December 31, 2012  (5,850)   412   (5,438)   163,253   (412)   162,841
Nine months ended September 30, 2012  (987)   260   (727)   69,152   (260)   68,892
Six months ended June 30, 2012  (470)   119   (351)   49,499   (119)   49,380

                      
  Three Months Ended Six Months Ended Nine Months Ended  Year Ended
  March 31, June 30, September 30,  December 31,
  2013 2012 2013 2012 2013 2012 2012
Asset management fees settled in shares$ 329 $ 55 $ 805 $ 143 $ 1,583 $ 296 $ 490