Business Acquisition Purchase Price Allocation Square Footage.

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Debt Instrument, Repayments of Principal

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Line of credit facility basis spread on variable rate.

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Notes Assumed, Unamortized Premium

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- Definition

Area of a real estate property.

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

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

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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

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
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Gross amount of debt extinguished.

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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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No definition available.

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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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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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Notes and Bonds Payable (Details) $ in Thousands						3 Months Ended	9 Months Ended	12 Months Ended
Notes and Bonds Payable (Details) $ in Thousands	Sep. 01, 2016 USD ($) ft²	Jul. 29, 2016 USD ($)	May 13, 2016 USD ($) ft²	Apr. 29, 2016 USD ($) ft²	Feb. 11, 2016 USD ($) ft²	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Sep. 12, 2016 ft²	Jul. 05, 2016 USD ($)	Mar. 31, 2016 ft²	Jan. 05, 2016 USD ($) ft²
Debt Instrument [Line Items]
Notes and bonds payable						$ 1,239,062	$ 1,239,062	$ 1,424,992
Square footage of owned real estate properties \| ft²						14,500,000	14,500,000
Square footage of real estate acquired \| ft²						370,606	370,606
CALIFORNIA \| Mortgage Note Financing [Member]
Debt Instrument [Line Items]
Secured Debt			$ 13,200									$ 11,500
Stated interest rate (percent)												3.60%
CALIFORNIA \| Real Estate Acquisitions [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)			4.77%
Square footage of real estate acquired \| ft²			63,012
Premium recorded at acquisition			$ 800				$ 800
WASHINGTON \| Real Estate Acquisitions [Member]
Debt Instrument [Line Items]
Square footage of real estate acquired \| ft²				46,637					87,462		69,712
Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Notes and bonds payable						$ 81,000	$ 81,000	206,000
Effective interest rate (percent)						1.53%	1.53%
Commitment fee percentage (percent)						0.20%
Upfront lender fees		$ 4,400
Borrowings outstanding						$ 81,000	$ 81,000
Remaining borrowing capacity						619,000	619,000
Medium-term Notes [Member] \| Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Notes and bonds payable						$ 149,432	$ 149,432	199,257		$ 150,000
Effective interest rate (percent)						1.72%	1.72%
Repayment of loan										$ 50,000
Weighted average interest rate (percent)										1.60%
Senior Notes [Member] \| Senior Notes due 2021, net of discount and issuance costs [Member]
Debt Instrument [Line Items]
Notes and bonds payable						$ 396,980	$ 396,980	396,489
Effective interest rate (percent)						5.97%	5.97%
Senior Notes [Member] \| Senior Notes due 2023, net of discount and issuance costs [Member]
Debt Instrument [Line Items]
Notes and bonds payable						$ 247,196	$ 247,196	246,897
Effective interest rate (percent)						3.95%	3.95%
Senior Notes [Member] \| Senior Notes due 2025, net of discount and issuance costs [Member]
Debt Instrument [Line Items]
Notes and bonds payable						$ 247,764	$ 247,764	247,602
Effective interest rate (percent)						4.08%	4.08%
Senior Notes [Member] \| Medical Office Building [Member] \| 3.60% Secured Note [Member]
Debt Instrument [Line Items]
Square footage of owned real estate properties \| ft²												90,607
Mortgages [Member]
Debt Instrument [Line Items]
Notes and bonds payable						$ 116,690	$ 116,690	$ 128,747
Effective interest rate (percent)						5.14%	5.14%
Mortgages [Member] \| 5.49% Secured Note [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)								5.49%
Outstanding principal								$ 11,400
Mortgages [Member] \| 5.86% Secured Note [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)					5.86%
Outstanding principal					$ 10,200
Mortgages [Member] \| 5.99% Secured Note [Member]
Debt Instrument [Line Items]
Stated interest rate (percent)				5.99%
Outstanding principal				$ 7,300
Mortgages [Member] \| 4.77% Secured Note [Member]
Debt Instrument [Line Items]
Effective interest rate (percent)			4.13%
Stated interest rate (percent)			4.77%
Mortgages [Member] \| WASHINGTON
Debt Instrument [Line Items]
Stated interest rate (percent)	6.01%
Outstanding principal	$ 15,700
Mortgages [Member] \| Medical Office Building [Member] \| 5.86% Secured Note [Member]
Debt Instrument [Line Items]
Square footage of owned real estate properties \| ft²					90,633
Mortgages [Member] \| Medical Office Building [Member] \| 5.99% Secured Note [Member]
Debt Instrument [Line Items]
Square footage of owned real estate properties \| ft²				42,957
Mortgages [Member] \| Medical Office Building [Member] \| WASHINGTON
Debt Instrument [Line Items]
Square footage of owned real estate properties \| ft²	70,623
London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Margin rate (percent)		1.00%
Minimum [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Commitment fee percentage (percent)		0.13%
Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Margin rate (percent)		0.83%
Maximum [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Commitment fee percentage (percent)		0.30%
Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Margin rate (percent)		1.55%