Other Income (Expenses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other Income and Expenses [Abstract]
Interest and investment income	$ 148	$ 336	$ 1,621
Income tax expense	(645)	(1,016)	(831)
Loss from real estate joint ventures	0	0	(188)
Acquisition related expenses	0	(152)	(434)
Fee income from real estate joint ventures	0	0	44
Other non-operating income	10	203	0
Total other income (expense)	$ (487)	$ (629)	$ 212