Loans Receivable and Other Lending Investments, net (Troubled Debt Restructurings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013 loans	Jun. 30, 2013 loans
Senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	2	3
Pre-Modification Outstanding Recorded Investment	$ 71,758	$ 144,432
Post-Modification Outstanding Recorded Investment	$ 71,758	$ 136,758
Performing senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans	1	3
Non-performing senior mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans		1