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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Schedule of Cost-method Investments        
Other than temporary impairment losses $ 0 $ 0 $ 0 $ 0
Other Long-term Investments        
Schedule of Cost-method Investments        
Investment in limited partnership     8,157  
Other Long-term Investments | Limited Partnership        
Schedule of Cost-method Investments        
Investment in limited partnership     7,857  
Other Long-term Investments | Limited Partnership | Kayne Senior Credit Fund II, L.P.        
Schedule of Cost-method Investments        
Additional obligation to fund investment     316  
Other Long-term Investments | Limited Partnership | Blackstone Alternative Solutions Trust 2015        
Schedule of Cost-method Investments        
Additional obligation to fund investment     495  
Other Long-term Investments | Limited Partnership | Kayne Senior Credit Fund III, L.P.        
Schedule of Cost-method Investments        
Additional obligation to fund investment     802  
Other Long-term Investments | Level 3        
Schedule of Cost-method Investments        
Transfers in     0  
Other Long-term Investments | Level 3 | Limited Partnership        
Schedule of Cost-method Investments        
Investment in limited partnership     $ 684  
Valuation period for other investments     60 months