Loans Receivable (Details) $ in Thousands		1 Months Ended	12 Months Ended
		Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) class_of_financing	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) portfolio_segment type_of_financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	[1]	$ 105,635	$ 95,871	$ 105,635
Number of types of financing receivable | type_of_financing					2
Number of portfolio segments | portfolio_segment					1
Net proceeds from sale of properties			$ 156,461	237,866	$ 75,519
Number of classes of financing receivable | class_of_financing			1
Westmont, Illinios [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	[1],[2]	12,152	$ 0	$ 12,152
Interest Rate	[2]		6.45%	6.45%
Cash acquired through foreclosure			$ 2,521
Litigation settlement, amount			1,400
Loan losses					13,939
Impaired interest income				$ 1,284	$ 1,737
Southfield, Michigan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	[1],[3]	3,296	$ 0	$ 3,296
Interest Rate	[3]		4.55%	4.55%
Loan losses				$ 2,500
Impaired interest income			$ 14	468
Oklahoma City, Oklahoma [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	[1],[4]	0	$ 8,501	0
Interest Rate	[4]		11.50%
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount			$ 8,420
Co-venture equity ownership percentage			40.00%
Austin, Texas [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	[1]	2,800	$ 0	$ 2,800
Interest Rate				16.00%
Kennewick, Washington [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	[1]	85,254	$ 85,505	$ 85,254
Interest Rate			9.00%	9.00%
Other Loan Locations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable, net amount	[1]	2,133	$ 1,865	$ 2,133
Interest Rate			8.00%	8.00%
Greenville, South Carolina [Member] | Office Building [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, if any.

[2] In 2015, the Company acquired the office property collateral and $2,521 of cash collateral and received $1,400 in full settlement of its claim against the borrower. 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.

[3] In 2015, the Company acquired the office property collateral from the borrower. 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 2015 and 2014, the Company recognized $14 and $468, respectively, of interest income relating to the impaired loan

[4] In 2015, the Company loaned a tenant-in-common $8,420. The loan is secured by the tenant-in-common's interest in an office property in which the Company has a 40% interest.