Business Acquisition Purchase Price Allocation Square Footage.

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- Definition

Debt Instrument, Redemption, Accrued Interest

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Debt Instrument, Redemption Price

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- Definition

Extinguishment of Debt, Accrued Interest

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- Definition

Line of credit facility basis spread on variable rate.

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- Definition

Line of Credit Facility, Facility Fee Percentage

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- Definition

Notes Assumed, Unamortized Premium

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- Definition

Number of Forward Starting Swaps

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No definition available.

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- Definition

Area of a real estate property.

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- Definition

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

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- Definition

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

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No definition available.

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- Definition

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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-Subparagraph (SX 210.5-02.22(a)(1))

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

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Gross amount of debt extinguished.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Notes and Bonds Payable (Details)										3 Months Ended		8 Months Ended	9 Months Ended
Notes and Bonds Payable (Details)	Oct. 01, 2015 USD ($) ft²	Sep. 14, 2015	Sep. 01, 2015 USD ($) ft²	Jun. 26, 2015 USD ($) ft²	Jun. 01, 2015 USD ($) ft²	May. 15, 2015 USD ($)	May. 04, 2015 USD ($) ft²	Apr. 01, 2015 USD ($) ft²	Jan. 30, 2015 USD ($) ft²	Sep. 30, 2015 USD ($) ft²	Sep. 30, 2014 USD ($)	Sep. 14, 2015	Sep. 30, 2015 USD ($) ft² swap_agreement	Sep. 30, 2014 USD ($)	Oct. 31, 2015 ft²	Apr. 24, 2015 USD ($)
Debt Instrument [Line Items]
Number of forward starting swaps \| swap_agreement													4
Loss on early extinguishment of debt										$ 0	$ 0		$ (27,998,000)	$ 0
Square footage of owned real estate properties \| ft²										14,100,000			14,100,000
Real Estate Acquisitions [Member]
Debt Instrument [Line Items]
Square footage \| ft²										246,558			246,558
Mortgage notes payable assumed													$ 18,900,000
Fair value premium recorded upon acquisition													$ 500,000
Washington [Member] \| Real Estate Acquisitions [Member]
Debt Instrument [Line Items]
Square footage \| ft²			52,813	35,558
Mortgage notes payable assumed			$ 9,400,000	$ 9,500,000
Fair value premium recorded upon acquisition			$ 300,000	$ 200,000
Stated interest rate (percent)			5.00%	5.75%
Effective interest rate (percent)			4.17%	5.07%
Medium-term Notes [Member] \| Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Unsecured term loan facility, basis spread on variable interest rate (percent)		1.20%										1.45%
Senior Notes [Member] \| 3.875% Unsecured Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)																3.875%
Effective interest rate (percent)																3.885%
Debt face amount																$ 250,000,000.0
Debt discount																200,000
Debt issuance costs																$ 2,300,000
Senior Notes [Member] \| Unsecured Senior Notes Due 2017 [Member]
Debt Instrument [Line Items]
Debt redemption price						$ 333,200,000
Notes and bonds payable						300,000,000
Debt Redemption, accrued interest						6,400,000
Make-whole payment						26,800,000
Unaccreted discount and unamortized costs						1,200,000
Loss on early extinguishment of debt						$ (28,000,000)
Senior Notes [Member] \| 5.0% Secured Note [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)								5.00%
Amount of debt repaid								$ 10,200,000
Senior Notes [Member] \| 5.45% Secured Note [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)									5.45%
Amount of debt repaid									$ 15,000,000
Debt repayment, accrued interest									$ 100,000
Senior Notes [Member] \| Medical Office Building [Member] \| 5.0% Secured Note [Member]
Debt Instrument [Line Items]
Square footage of owned real estate properties \| ft²								44,169
Senior Notes [Member] \| Medical Office Building [Member] \| 5.45% Secured Note [Member]
Debt Instrument [Line Items]
Square footage of owned real estate properties \| ft²									73,548
Mortgages [Member] \| 5.41% Mortgage Note Payable [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)					5.25%		5.41%
Amount of debt repaid					$ 4,000,000		$ 16,300,000
Debt repayment, accrued interest							$ 100,000
Mortgages [Member] \| Medical Office Building [Member] \| 5.41% Mortgage Note Payable [Member]
Debt Instrument [Line Items]
Square footage of owned real estate properties \| ft²					29,423		142,856
Subsequent Event [Member] \| Medical Office Building [Member] \| Washington [Member] \| Real Estate Acquisitions [Member]
Debt Instrument [Line Items]
Square footage \| ft²															33,169
Subsequent Event [Member] \| Senior Notes [Member] \| 5.4% Mortgage Note Payable [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)	5.40%
Amount of debt repaid	$ 10,600,000
Subsequent Event [Member] \| Senior Notes [Member] \| Medical Office Building [Member] \| 5.4% Mortgage Note Payable [Member]
Debt Instrument [Line Items]
Square footage of owned real estate properties \| ft²	88,408
London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Line of credit facility, basis spread on variable rate (percent)		1.15%										1.40%
Line of Credit Facility, facility fee (percent)		0.20%										0.30%