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Debt (Details) - USD ($)
3 Months Ended
Jun. 03, 2015
Nov. 19, 2014
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Debt          
Amount outstanding     $ 228,500,000   $ 233,000,000
Debt interest expense     2,347,491 $ 1,886,720  
Interest payable     234,420   $ 294,132
Deferred loan costs amortization     196,972 354,590  
Interest expense.          
Debt          
Deferred loan costs amortization     196,972 354,590  
Senior secured revolving credit facility          
Debt          
Borrowing capacity $ 250,000,000 $ 190,000,000      
Maximum borrowing capacity increase $ 60,000,000        
Amount outstanding     228,500,000    
Undrawn borrowing capacity     $ 21,500,000    
Senior secured revolving credit facility | Federal funds rate          
Debt          
Applicable margin   0.50%      
Senior secured revolving credit facility | Base rate option | Federal funds rate          
Debt          
Applicable margin   1.50%      
Senior secured revolving credit facility | Base rate option | One month LIBOR          
Debt          
Applicable margin   1.50%      
Senior secured revolving credit facility | Base rate option | Administrative agent's prime rate | Minimum          
Debt          
Applicable margin   1.50%      
Senior secured revolving credit facility | LIBOR option | One month LIBOR          
Debt          
Applicable margin   1.00%      
Senior secured revolving credit facility | LIBOR option | One month LIBOR | Maximum          
Debt          
Applicable margin   2.50%      
Secured debt facilities | Acquired Funds | Restatement          
Debt          
Debt interest expense       875,064  
Secured debt facilities | Acquired Funds | Interest expense. | Restatement          
Debt          
Deferred loan costs amortization       $ 211,212