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Borrowing Arrangements (Scheduled Maturities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2015	$ 745,847,000
2016	899,730,000
2017	804,627,000
2018	2,015,893,000
2019	2,308,964,000
Thereafter	4,097,310,000
Total maturities	10,872,371,000us-gaap_DebtInstrumentCarryingAmount	9,320,477,000us-gaap_DebtInstrumentCarryingAmount
Unrestricted cash and cash equivalents	55,348,000	94,816,000	67,908,000	45,807,000
Amount outstanding, net of cash and cash equivalents	863,800,000
Minimum percentage of total unencumbered assets as a percentage of unsecured debt required to be maintained (as a percent)	150.00%
Principal Amount Due at Maturity
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2015	704,082,000
2016	861,817,000
2017	777,127,000
2018	1,075,209,000
2019	2,294,979,000
Thereafter	3,952,366,000
Total maturities	9,665,580,000
Unsecured Revolving Credit Facility
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2015	0
2016	0
2017	0
2018	919,099,000
2019	0
Thereafter	0
Total maturities	919,099,000	376,343,000
Scheduled Periodic Amortization
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
2015	41,765,000
2016	37,913,000
2017	27,500,000
2018	21,585,000
2019	13,985,000
Thereafter	144,944,000
Total maturities	287,692,000
Mortgage loans held for sale
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Total maturities	43,500,000	13,100,000
Senior Notes \| 6.90% Senior Notes due 2037
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Thereafter	52,400,000
Interest rate (as a percent)	6.90%
Senior Notes \| 6.59% senior notes due 2038
Scheduled maturities of borrowing arrangements and other provisions excluding capital lease obligations
Thereafter	$ 23,000,000
Interest rate (as a percent)	6.59%