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Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Schedule of Cost-method Investments    
Other than temporary impairment losses $ 0 $ 0
Other Long-term Investments    
Schedule of Cost-method Investments    
Investment in limited partnership 14,943  
Other Long-term Investments | Limited Partnership    
Schedule of Cost-method Investments    
Investment in limited partnership 14,643  
Other Long-term Investments | Limited Partnership | Kayne Senior Credit Fund II, L.P.    
Schedule of Cost-method Investments    
Additional obligation to fund investment 342  
Other Long-term Investments | Limited Partnership | Blackstone Alternative Solutions Trust 2015    
Schedule of Cost-method Investments    
Additional obligation to fund investment 665  
Other Long-term Investments | Limited Partnership | Green Street Power Partners    
Schedule of Cost-method Investments    
Additional obligation to fund investment 598  
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 $ 1,666  
Valuation period for other investments 60 months