Real Estate Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Minimum	Sep. 30, 2014 Maximum	Aug. 01, 2014 California Non-Utility Property	Jun. 30, 2014 Texas Retail Buildings	Feb. 01, 2013 Connecticut Warehouse
Schedule of Investments [Line Items]
Land	$ 17,297		$ 17,297		$ 18,892
Buildings and improvements	56,164		56,164		59,256
Intangibles	329		329		329
Subtotal	73,790		73,790		78,477
Less accumulated depreciation and amortization	11,201		11,201		10,658
Total	62,589		62,589		67,819
Estimated useful life						5 years	39 years
Proceeds from sale of real estate held-for-investment								300	4,450	9,200
Gain on sale of real estate investment	281	0	554	1,063				281	273	1,063
Real estate selling expenses								$ 10	$ 169	$ 369