Business Combinations and Sale of Joint Venture Equity Interests (Details 1) (Variable Interest Entity, Primary Beneficiary [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Variable Interest Entity, Primary Beneficiary [Member]
Revenues	$ 18,617	$ 13,243
Depreciation and amortization	(7,159)	(7,128)
Net loss	2,229	(8,119)
Net income (loss) attributable to noncontrolling interest	3,585	(3,304)
Net loss attributable to common shareholders	$ (1,356)	$ (4,815)
Net loss per common share	$ (0.80)	$ (5.95)