Indebtedness - Amortization and Maturity Schedule (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Unsecured Debt	$ 2,708,213	$ 2,258,751
Line of Credit Facility, Amount Outstanding	0	92,000
Long-term Debt	3,253,519
Long-term Debt, Weighted Average Interest Rate	5.05%
Principal Amortization, Mortgages [Member]
Debt Instrument [Line Items]
2014	11,088
2015	12,138
2016	11,720
2017	10,916
2018	8,730
2019	8,680
2020	4,280
2021	2,716
2022	2,172
2023 and thereafter	29,625
Mortgages Principal Amortization	102,065
Principal Maturities, Mortgages [Member]
Debt Instrument [Line Items]
2014	2,696
2015	44,469
2016	182,318
2017	2,349
2018	27,051
2019	50,043
2020	67,361
2021	65,008
2022	0
2023 and thereafter	1,946
Mortgages Principal Maturities	443,241
Unsecured Debt [Member]
Debt Instrument [Line Items]
2014	199,953
2015	315,869
2016	299,362
2017	295,861
2018	99,968
2019	0
2020	349,441
2021	0
2022	399,342
2023 and thereafter	748,417
Unsecured Debt	2,708,213
Line of Credit [Member]
Debt Instrument [Line Items]
2014	0
2015	0
2016	0
2017	0
2018	0
2019	0
2020	0
2021	0
2022	0
2023 and thereafter	0
Line of Credit Facility, Amount Outstanding	$ 0
2014
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	5.63%
2015
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	5.16%
2016
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	6.08%
2017
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	6.57%
2018
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	6.80%
2019
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	3.99%
2020
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.83%
2021
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.06%
2022
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.14%
2023 and thereafter
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	4.03%

Long-term Debt, Maturities, Repayments of Principal After Year Nine

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Long-term Debt, Maturities, Repayments of Principal in Year Eight

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Long-term Debt, Maturities, Repayments of Principal in Year Nine

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Long-term Debt, Maturities, Repayments of Principal in Year Seven

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Long-term Debt, Maturities, Repayments of Principal in Year Six

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Mortgages Principal Amortization

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Mortgages Principal Maturities

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- Definition

Amount borrowed under the credit facility as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Number 210

-Section 02

-Paragraph 19, 22

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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-Topic 470

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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Weighted average interest rate of long-term debt outstanding.

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- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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-Subparagraph (SX 210.9-03.16)

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