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Other Investments (Schedule of Other Investments) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($) Investee	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($) Investee	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 290,519		$ 290,519		$ 354,119
Earnings (loss) from equity method investments	10,572	$ 49,578	25,904	$ 76,848
Equity Method Investee \| Investee		1		1
Net Lease Venture
Schedule of Equity Method Investments [Line Items]
Equity method investments	68,719		68,719		125,361
Earnings (loss) from equity method investments	971	$ 349	4,270	$ 152
Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	81,437		81,437		88,848
Earnings (loss) from equity method investments	(2,906)	33,509	(4,545)	36,004
Other Investments
Schedule of Equity Method Investments [Line Items]
Equity method investments	51,751		51,751		63,262
Earnings (loss) from equity method investments	2,159	11,889	6,658	39,863
Madison Funds
Schedule of Equity Method Investments [Line Items]
Equity method investments	38,299		38,299		45,971
Earnings (loss) from equity method investments	331	3,982	(115)	1,591
Marina Palms
Schedule of Equity Method Investments [Line Items]
Equity method investments	50,313		50,313		$ 30,677
Earnings (loss) from equity method investments	$ 10,017	(151)	$ 19,636	(762)
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity method investments		32,900		32,900
Equity method investee 2
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity method investments				23,400
Oak Hill Funds
Schedule of Equity Method Investments [Line Items]
Earnings (loss) from equity method investments		$ 9,000		$ 9,000