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Investments (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule of Cost-Method Investments        
Other than temporary impairment losses $ 0 $ 0 $ 0 $ 0
Kayne Senior Credit Fund II, L.P.        
Schedule of Cost-Method Investments        
Investment in limited partnership     831,000  
Additional obligation to fund investment     1,169,000  
Limited Partnership        
Schedule of Cost-Method Investments        
Investment in limited partnership     $ 2,736,000  
Valuation period for other investments     60 months  
Other Long-Term Investments | Level 3        
Schedule of Cost-Method Investments        
Transfers in     $ 0