Corporate Indebtedness (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Amortization and Maturities of Long-term Debt [Abstract]
Remaining 2014	$ 245,311
2015	277,024
2016	825,565
2017	1,502,650
2018	314,462
Thereafter	5,234,635
Total amortization of debt and principal repayments	8,399,647
Mortgages and other loans payable
Scheduled Amortization
Remaining 2014	23,163
2015	47,480
2016	55,946
2017	61,063
2018	64,462
Thereafter	246,979
Total amortization of debt	499,093
Principal Repayments
Remaining 2014	146,250
2015	229,537
2016	514,311
2017	1,086,579	[1]
2018	0
Thereafter	3,654,656
Total principal repayments	5,631,333	[1]
Trust Preferred Securities
Amortization and Maturities of Long-term Debt [Abstract]
Thereafter	100,000
Total amortization of debt and principal repayments	100,000
Term Loan and Senior Unsecured Notes
Amortization and Maturities of Long-term Debt [Abstract]
Remaining 2014	75,898
2015	7
2016	255,308
2017	355,008
2018	250,000
Thereafter	1,233,000
Total amortization of debt and principal repayments	2,169,221
Joint Venture
Amortization and Maturities of Long-term Debt [Abstract]
Remaining 2014	27,651
2015	44,260
2016	561,736
2017	442,584
2018	28
Thereafter	353,580
Total amortization of debt and principal repayments	$ 1,429,839

[1] Principal repayments include the mortgage at 2 Herald Center, which is included in liabilities related to assets held for sale.