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Other Investments (Schedule of Other Investments) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Investee
Dec. 31, 2014
USD ($)
Schedule of Equity Method Investments [Line Items]          
Equity method investments $ 289,500   $ 289,500   $ 354,119
Earnings (loss) from equity method investments 8,785 $ 24,093 15,332 $ 27,270  
Equity Method Investee | Investee       1  
Equity Method Investee [Member]          
Schedule of Equity Method Investments [Line Items]          
Earnings (loss) from equity method investments       $ 23,400  
Net Lease Venture          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 70,409   70,409   125,361
Earnings (loss) from equity method investments 1,666 164 3,299 (198)  
Other real estate equity investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 84,119   84,119   88,848
Earnings (loss) from equity method investments (337) 1,561 (1,638) 2,495  
Other Investments          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 50,088   50,088   63,262
Earnings (loss) from equity method investments 2,765 24,640 4,498 27,974  
Madison Funds          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 44,589   44,589   45,971
Earnings (loss) from equity method investments (408) (1,989) (445) (2,391)  
Marina Palms          
Schedule of Equity Method Investments [Line Items]          
Equity method investments 40,295   40,295   $ 30,677
Earnings (loss) from equity method investments $ 5,099 $ (283) $ 9,618 $ (610)