Subsequent Events (Details) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 08, 2014 Seller Financing [Member]	Dec. 31, 2010 Seller Financing [Member] property
Subsequent Event [Line Items]
Number of office properties sold					7
Proceeds received from the sale of real estate					$ 12,900,000
Cash received from sale of real estate					4,500,000
Seller financing provided					8,400,000
Additional loan commitment to third party					1,700,000
Amount of committed additional seller financing funded					800,000
Repayment of seller financing	405,000	1,776,000	444,000	9,200,000
Deferred gain on sale of real estate				$ 0.4	$ 0.4