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Long-Term Investments (Cost-Method Investments) (Details)
6 Months Ended
Jun. 30, 2017
USD ($)
investment
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Cost-method Investments [Line Items]      
Cost-method investments, carrying value $ 60,450,000   $ 35,476,000
Cost-method investments, fair value 68,857,000   41,063,000
Cash distributions from cost method investments (663,000) $ (1,000,000)  
Purchase of long-term investments $ 26,000,000 50,000  
Five New Investment Funds [Member]      
Schedule of Cost-method Investments [Line Items]      
Number of investments in funds | investment 5    
One Existing Investment [Member]      
Schedule of Cost-method Investments [Line Items]      
Number of investments in funds | investment 1    
Investment partnerships      
Schedule of Cost-method Investments [Line Items]      
Cost-method investments, carrying value $ 60,450,000   34,975,000
Cost-method investments, fair value 68,857,000   40,569,000
Purchase of long-term investments   $ 0  
Investment partnerships | Five New Investment Funds [Member]      
Schedule of Cost-method Investments [Line Items]      
Purchase of long-term investments 25,000,000    
Investment partnerships | One Existing Investment [Member]      
Schedule of Cost-method Investments [Line Items]      
Purchase of long-term investments 1,000,000    
Real estate partnership      
Schedule of Cost-method Investments [Line Items]      
Cost-method investments, carrying value 0   501,000
Cost-method investments, fair value $ 0   $ 494,000