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Indebtedness (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended			1 Months Ended	3 Months Ended		9 Months Ended									1 Months Ended		3 Months Ended	1 Months Ended		1 Months Ended		1 Months Ended		1 Months Ended	4 Months Ended
	Sep. 30, 2014 item	Sep. 30, 2014 item	Sep. 30, 2013	Dec. 31, 2013	Oct. 31, 2014 Subsequent event	Sep. 30, 2014 Unsecured revolving credit facility	Sep. 30, 2013 Unsecured revolving credit facility	Sep. 30, 2014 Unsecured revolving credit facility	Sep. 30, 2013 Unsecured revolving credit facility	Aug. 04, 2014 Unsecured revolving credit facility	Jun. 30, 2014 Unsecured revolving credit facility	Aug. 04, 2014 Unsecured revolving credit facility Subsequent event	Sep. 30, 2014 Senior unsecured notes 4.30%	Sep. 30, 2014 Senior unsecured notes 6.75%	Sep. 30, 2014 Unsecured senior notes due 2021	Sep. 30, 2014 Senior unsecured notes 5.625% due in 2042	Jun. 30, 2014 Mortgages item	Sep. 30, 2014 Mortgages property building	Sep. 30, 2014 Mortgages Significant Unobservable Inputs (Level 3)	Oct. 31, 2014 Mortgages Subsequent event property	Sep. 30, 2014 Capital leases property	Apr. 30, 2014 Senior unsecured notes due 2019	Sep. 30, 2014 Senior unsecured notes due 2019	Apr. 30, 2014 Senior unsecured notes due 2024	Sep. 30, 2014 Senior unsecured notes due 2024	May 31, 2014 Unsecured Debt	Sep. 30, 2014 Unsecured Debt	Jun. 30, 2014 Unsecured Debt
Indebtedness
Number of public issues of unsecured senior notes	6	6
Principal amount of unsecured senior notes	$ 1,743,272	$ 1,743,272		$ 1,093,337									$ 250,000	$ 200,000	$ 300,000	$ 350,000							$ 400,000		$ 250,000
Unsecured term loan facility																												350,000
Aggregate principal amount of mortgage debt																		652,359
Interest rate (as a percent)	1.55%	1.55%			5.875%								4.30%	6.75%	6.75%	5.625%			6.28%	6.25%		3.25%	3.25%	4.75%	4.75%
Number of buildings mortgaged																		50
Number of properties mortgaged																		47
Number of properties recorded under capital lease																					2
Carrying value of mortgaged properties	5,237,502	5,237,502		4,422,865														881,216			18,375
Capital leases																					12,910
Extension period of revolving credit facility								1 year
Principal repayment due until maturity								0
Option to increase the borrowing capacity under revolving credit facility						1,500,000		1,500,000
Maximum borrowing capacity that may be increased																										700,000
Interest rate, description								LIBOR																			LIBOR
Interest rate added to the base rate (as a percent)								1.30%																		1.40%
Debt instrument, facility fee (as a percent)								0.30%
Weighted average interest rate on debt (as a percent)						1.42%	1.64%	1.42%	1.68%
Debt, Weighted Average Interest Rate																	5.80%											1.55%
Unsecured revolving credit facility				100,000						0	0
Revolving credit facility, available amount						750,000		750,000				750,000
Sale of senior unsecured notes		350,000																				400,000		250,000
Net proceeds after underwriting discounts from sale of senior unsecured notes	644,889																							644,889
Assumption of mortgage notes payable		15,630	12,266																15,630
Fair value of mortgage notes payable																			16,643
Number of mortgage notes																	2
Repayment of debt					$ 14,700												$ 35,300			$ 11,900
Number of properties encumbered under mortgage notes																				1
Revolving credit facility, interest rate payable (as a percent)						1.45%		1.45%

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Represents the extension term of the debt agreement.

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Represents the maximum borrowing capacity to which loan may be expanded per the terms of the agreement, at the option of the reporting entity.

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Weighted average interest rate on debt during the period.

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Represents the option to increase borrowings on the credit facility.

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Represents the number of buildings serving as collateral for debt as of the balance sheet date.

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The number of real estate properties serving as collateral for debt as of the balance sheet date.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Weighted average interest rate of debt outstanding.

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Gross amount of debt extinguished.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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The effective interest rate at the end of the reporting period.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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