Loans Receivable (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended					1 Months Ended
	Dec. 31, 2014 portfolio_segment type_of_financing class_of_financing		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	$ 105,635	[1]	$ 99,443	[1]		$ 105,635	[1]
Loans receivable, net	105,635		99,443			105,635
Number of types of financing receivable	2
Number of portfolio segments	1
Net proceeds from sale of properties	237,866		75,519		155,240
Number of classes of financing receivable	1
Norwalk, Connecticut [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	0	[1],[2]	28,186	[1],[2]		0	[1],[2]
Interest Rate	7.50%	[2]	7.50%	[2]
Homestead, Florida [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	0	[1],[2]	10,239	[1],[2]		0	[1],[2]
Interest Rate	7.50%	[2]	7.50%	[2]
Westmont, Illinios [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	12,152	[1],[3]	12,610	[1],[3]		12,152	[1],[3]
Interest Rate	6.45%	[3]	6.45%	[3]
Loan losses			13,939
Impaired interest income	1,284		1,737
Average recorded investment	12,812		25,562
Unpaid principal balance	26,786					26,786
Southfield, Michigan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	3,296	[1],[4]	6,610	[1],[4]		3,296	[1],[4]
Interest Rate	4.55%	[4]	4.55%	[4]
Loan losses	2,500
Impaired interest income	468
Average recorded investment	6,001
Unpaid principal balance	5,810					5,810
Austin, Texas [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	2,800	[1]	2,389	[1]		2,800	[1]
Interest Rate	16.00%		16.00%
Kennewick, Washington [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	85,254	[1]	37,030	[1]		85,254	[1]
Interest Rate	9.00%		9.00%
Other Loan Locations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan carrying-value	2,133	[1]	2,379	[1]		2,133	[1]
Interest Rate	8.00%		8.00%
Schaumburg, Illinios [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unrecorded interest income related to impaired loan			2,939		2,647
Office Building [Member] | Greenville, South Carolina [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net proceeds from sale of properties						$ 11,491

[1] Loan carrying value includes accrued interest and is net of origination costs and loan losses.

[2] Loan satisfied during 2014.

[3] Borrowers are in default and the Company commenced foreclosure proceedings. Tenant at office property collateral terminated its lease. The Company recognized a loan loss of $13,939 during 2013. During 2014 and 2013, the Company recognized $1,284 and $1,737, respectively, of interest income relating to the impaired loan and the loan had an average recorded investment value of $12,812 and $25,562 during 2014 and 2013, respectively. At December 31, 2014, the impaired loan receivable had a contractual unpaid balance of $26,786.

[4] The Company recorded a $2,500 loan loss in 2014 as the Company determined it was probable that it would not collect the amount owed at maturity. During 2014, the Company recognized $468 of interest income relating to the impaired loan and the loan had an average recorded investment of $6,001 during 2014. At December 31, 2014, the impaired loan receivable had a contractual unpaid balance of $5,810.