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Other Investments (Schedule of Other Investments) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]      
Equity method investments, carrying value $ 197,559   $ 214,406
Earnings (loss) from equity method investments 5,702 $ 8,267  
Other strategic investments      
Schedule of Equity Method Investments [Line Items]      
Equity method investments, carrying value 32,866   33,350
Earnings (loss) from equity method investments 247 802  
Oak Hill Funds      
Schedule of Equity Method Investments [Line Items]      
Earnings (loss) from equity method investments   3,200  
Real estate equity investments      
Schedule of Equity Method Investments [Line Items]      
Equity method investments, carrying value 164,693   181,056
Earnings (loss) from equity method investments 5,455 7,465  
Real estate equity investments | Net lease venture      
Schedule of Equity Method Investments [Line Items]      
Equity method investments, carrying value 92,024   92,669
Earnings (loss) from equity method investments 981 946  
Real estate equity investments | Marina Palms      
Schedule of Equity Method Investments [Line Items]      
Equity method investments, carrying value 19,439   35,185
Earnings (loss) from equity method investments 3,117 8,221  
Real estate equity investments | Other real estate equity investments      
Schedule of Equity Method Investments [Line Items]      
Equity method investments, carrying value 53,230   $ 53,202
Earnings (loss) from equity method investments $ 1,357 $ (1,702)