Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended	12 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2012 Scenario, Previously Reported	Sep. 30, 2012 Scenario, Previously Reported	Dec. 31, 2011 Misapplication Of Accounting Guidance Related To Recognition Of Deferred Tax Asset Scenario, Previously Reported	Dec. 31, 2011 Over accrual Of Incentive Compensation Cost Scenario, Previously Reported	Sep. 30, 2012 Misapplication of Accounting Guidance Related to Recognization of Losses Related to Consolidated Real Estate Joint Ventures [Member] Scenario, Previously Reported	Dec. 31, 2011 Misapplication of Accounting Guidance Related to Recognization of Losses Related to Consolidated Real Estate Joint Ventures [Member] Scenario, Previously Reported	Dec. 31, 2011 Misapplication of Accounting Guidance Related to Reporting for a Noncontrolling Interest in a Consolidated Real Estate Joint Venture [Member] Scenario, Previously Reported
Net (loss) income	$ (2,000)	$ (20,765)	$ 8,872	$ 1,331		$ (20,765)	$ (1,927)	$ (4,000)	$ 711	$ (1,800)	$ (1,400)
Redeemable noncontrolling interest	$ 16,789	$ 9,932	$ 16,789	$ 9,932	$ 10,298	$ 0	$ 0					$ 8,900