SENIOR NOTES PAYABLE AND OTHER DEBT (Details 2) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2013	$ 18,953,000
2014	919,302,000
2015	959,650,000
2016	804,540,000
2017	1,322,057,000
Thereafter	6,426,362,000
Total	10,450,864,000	9,320,477,000
Unrestricted cash and cash equivalents	64,595,000	94,816,000	54,672,000	67,908,000	54,672,000
Unsecured revolving credit facilities
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Total	225,359,000	376,343,000
Amount outstanding, net of cash and cash equivalents	160,800,000
Mortgage loans and other
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Total	2,414,695,000	2,524,889,000
6.90% Senior Notes due 2037
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Total	52,400,000	52,400,000
Interest rate (as a percent)	6.90%	6.90%
6.59% Senior Notes due 2038
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Total	22,973,000	22,973,000
Interest rate (as a percent)	6.59%	6.59%
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2013	7,372,000
2014	877,650,000
2015	921,817,000
2016	777,127,000
2017	1,075,209,000
Thereafter	6,267,876,000
Total	9,927,051,000
Unsecured Revolving Credit Facility
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2013	0
2014	0
2015	0
2016	0
2017	225,359,000
Thereafter	0
Total	225,359,000
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2013	11,581,000
2014	41,652,000
2015	37,833,000
2016	27,413,000
2017	21,489,000
Thereafter	158,486,000
Total	$ 298,454,000