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Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]    
Real estate and development in process, net $ 15,835,914 $ 11,959,168
Mortgage notes payable 4,484,657 3,102,485
Other liabilities 556,730 324,613
Total liabilities and equity 19,462,784 15,462,321
Carrying value of the Company's investments in unconsolidated joint ventures 137,975 659,916
Unconsolidated Joint Ventures [Member]
    
Schedule of Equity Method Investments [Line Items]    
Real estate and development in process, net 949,193 4,494,971
Other assets 162,065 673,716
Total assets 1,111,258 5,168,687
Mortgage notes payable 745,550 3,039,922
Other liabilities 25,756 792,888
Members'/Partners' equity 339,952 1,335,877
Total liabilities and equity 1,111,258 5,168,687
Company's share of equity 167,225 787,941
Basis differentials (29,250) [1] (128,025) [1]
Carrying value of the Company's investments in unconsolidated joint ventures $ 137,975 $ 659,916
[1] This amount represents the aggregate difference between the Company’s historical cost basis and the basis reflected at the joint venture level, which is typically amortized over the life of the related assets and liabilities. Basis differentials occur from impairment of investments and upon the transfer of assets that were previously owned by the Company into a joint venture. In addition, certain acquisition, transaction and other costs may not be reflected in the net assets at the joint venture level.