Income Taxes (Tax Effect of Significant Temporary Differences) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Tax effect of significant temporary differences representing deferred tax assets and liabilities
Income from unconsolidated joint ventures	$ 7,846	$ 26,009
Land	11,219	20,248
Long-term incentive equity awards	2,126	1,608
For-sale multi-family units basis differential	233	269
Interest Carryforward	13,158	13,158
Federal and state tax carryforwards	44,075	23,883
Other	323	860
Total deferred tax assets	78,980	86,035
Valuation allowance	(78,980)	(86,035)
Net deferred tax asset	$ 0	$ 0