Fair Value Measurements (Assets Measured On Nonrecurring Basis) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, net	$ 3,353,850,000	[1]	$ 3,359,011,000	[1]
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	11,876,000		43,910,000
Total Gains (Losses)	(2,358,000)	[2]	(9,579,000)	[2]
Nonrecurring [Member] | Impaired Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property	11,876,000	[3]	19,679,000	[4]
Total Gains (Losses)	(2,358,000)	[2],[3]	(2,971,000)	[2],[4]
Property, net	14,300,000		22,400,000
Cost to sell property			300,000
Nonrecurring [Member] | Impaired Investment In Real Estate Joint Ventures And Partnerships [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in real estate joint ventures and partnerships			24,231,000	[5]
Total Gains (Losses)			(6,608,000)	[2],[5]
Investment in real estate joint ventures and partnerships, net			30,800,000
Nonrecurring [Member] | Quoted Prices In Active Markets For Identical Assets And Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0		0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	3,300,000		30,004,000
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Impaired Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property	3,300,000	[3]	5,773,000	[4]
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Impaired Investment In Real Estate Joint Ventures And Partnerships [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in real estate joint ventures and partnerships			24,231,000	[5]
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	8,576,000		13,906,000
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property	$ 8,576,000	[3]	$ 13,906,000	[4]

[1] * Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 22):

[2] Total gains (losses) exclude impairments on disposed assets because they are no longer held by us.

[3] In accordance with our policy of evaluating and recording impairments on the disposal of long-lived assets, property with a carrying amount of $14.3 million was written down to a fair value of $11.9 million, resulting in a loss of $2.4 million, which was included in earnings for the period. Management’s estimate of the fair value of these properties was determined using bona fide purchase offer for the Level 2 inputs. See the quantitative information about the significant unobservable inputs used for our Level 3 fair value measurements table below.

[4] In accordance with our policy of evaluating and recording impairments on the disposal of long-lived assets, property with a carrying amount of $22.4 million was written down to a fair value of $19.7 million less costs to sell of $.3 million, resulting in a loss of $3.0 million, which was included in earnings for the period. Management’s estimate of fair value of these properties was determined using a bona fide purchase offer for the Level 2 inputs. See the quantitative information about the significant unobservable inputs used for our Level 3 fair value measurements table below.

[5] Our net investment in real estate joint ventures and partnerships with a carrying amount of $30.8 million was written down to a fair value of $24.2 million, resulting in a loss of $6.6 million, which was included in earnings for the period. Management’s estimate of fair value of this investment was determined using the weighted average of the bona fide purchase offers received for the Level 2 inputs.