Fair Value Measurements (Narratives) (Details) (USD $)			6 Months Ended			6 Months Ended			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Toys R Us [Member] Discounted Cash Flow Methodology [Member]	Jun. 30, 2014 Minimum [Member] Toys R Us [Member] Market Multiple Methodology [Member]	Jun. 30, 2014 Minimum [Member] Toys R Us [Member] Comparable Sales Methodology [Member]	Jun. 30, 2014 Minimum [Member] Toys R Us [Member] Black-Scholes Valuation Analysis [Member]	Jun. 30, 2014 Maximum [Member] Toys R Us [Member] Market Multiple Methodology [Member]	Jun. 30, 2014 Maximum [Member] Toys R Us [Member] Comparable Sales Methodology [Member]	Jun. 30, 2014 Maximum [Member] Toys R Us [Member] Black-Scholes Valuation Analysis [Member]	Jun. 30, 2014 Weighted Average [Member] Toys R Us [Member] Black-Scholes Valuation Analysis [Member]	Jun. 30, 2014 Real Estate Fund Investments	Jun. 30, 2014 Real Estate Fund Minimum [Member]	Jun. 30, 2014 Real Estate Fund Maximum [Member]	Jun. 30, 2014 Real Estate Fund Weighted Average [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number Of Investments Made By Fund											8
Aggregate fair value of Real Estate Fund investments (in US Dollars)	$ 549,091,000	$ 667,710,000									$ 549,091,000
Excess of fair value over cost (in US Dollars)											189,571,000
Fair Value Measurement Anticipated Investment Holding Period												0 years 1 month 6 days	6 years 0 months 0 days
Fair Value Inputs [Abstract]
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple			5.75	5.75			6.5
Fair Value Assumptions, Expected Volatility Rate						24.00%			29.00%
Fair Value Assumptions, Sales Of Comparable Companies (in US Dollars)					$ 150,000,000			$ 3,000,000,000
Financial Projections Period			5 years
Discount rates			10.00%									12.00%	17.50%	14.50%
Fair Value Inputs, Tax Rate			38.00%
Fair Value Assumptions, Expiration Periods						1 year			3 years	2 years