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Investments in Unconsolidated Joint Ventures (Balance Sheets of the Unconsolidated Joint Ventures) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
ASSETS    
Real estate and development in process, net $ 16,780,930 $ 16,507,008
Liabilities and Members'/Partners' Equity [Abstract]    
Mortgage notes payable, net 2,972,052 2,979,281
Other Liabilities 462,869 443,980
Total liabilities and equity / capital 19,961,163 19,372,233
Carrying value of the Company's investments in unconsolidated joint ventures 682,507 619,925
Unconsolidated Joint Ventures [Member]    
ASSETS    
Real estate and development in process, net 1,938,438 1,768,996
Other assets 397,442 367,743
Total assets 2,335,880 2,136,739
Liabilities and Members'/Partners' Equity [Abstract]    
Mortgage notes payable, net 1,524,951 1,437,440
Other Liabilities 126,179 99,215
Members'/Partners' equity 684,750 600,084
Total liabilities and equity / capital 2,335,880 2,136,739
Company's share of equity 349,576 286,495
Basis differentials [1] 308,320 307,485
Carrying value of the Company's investments in unconsolidated joint ventures [2],[3] 657,896 593,980
Unconsolidated Joint Ventures [Member]    
Liabilities and Members'/Partners' Equity [Abstract]    
Other Liabilities (24,600) (25,900)
Basis differentials $ 319,700 $ 322,500
[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 result from impairments of investments, acquisitions through joint ventures with no change in control 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. At June 30, 2018 and December 31, 2017, there was an aggregate basis differential of approximately $319.7 million and $322.5 million, respectively, between the carrying value of the Company’s investment in the joint venture that owns Colorado Center and the joint venture’s basis in the assets and liabilities, which differential (excluding land) shall be amortized over the remaining lives of the related assets and liabilities.
[2] Investments with deficit balances aggregating approximately $24.6 million and $25.9 million at June 30, 2018 and December 31, 2017, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheet
[3] Investments with deficit balances aggregating approximately $24.6 million and $25.9 million at June 30, 2018 and December 31, 2017, respectively, have been reflected within Other Liabilities in the Company’s Consolidated Balance Sheets.