Investments in Unconsolidated Entities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		0 Months Ended	3 Months Ended
	Mar. 31, 2014 HSRE and DCV Holdings [Member]	Mar. 31, 2013 HSRE and DCV Holdings [Member]	Mar. 31, 2013 Copper Beech [Member]	Mar. 31, 2014 Copper Beech [Member]
Schedule of Equity Method Investments [Line Items]
Revenues	$ 6,456	$ 4,762	$ 3,591	$ 19,265
Expenses:
Operating expenses	3,561	2,577	1,310	7,300
Interest expense	1,051	1,140	799	2,940
Depreciation and amortization	2,030	1,360	1,723	9,777
Other (income) expense	(53)	24	48	339
Total expenses	6,589	5,101	3,880	20,356
Net loss	$ (133)	$ (339)	$ (289)	$ (1,091)