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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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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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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

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Gross amount of debt extinguished.

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No definition available.

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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.

+ 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)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

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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

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.

+ 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)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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-Section 02
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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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Notes and Bonds Payable (Details) $ in Thousands					6 Months Ended	12 Months Ended
Notes and Bonds Payable (Details) $ in Thousands	Jul. 29, 2016 USD ($)	May 13, 2016 USD ($) ft²	Apr. 29, 2016 USD ($) ft²	Feb. 11, 2016 USD ($) ft²	Jun. 30, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Aug. 03, 2016 USD ($)	Jul. 05, 2016 USD ($)	Jan. 05, 2016 USD ($) ft²
Debt Instrument [Line Items]
Long-term Debt					$ 1,414,739	$ 1,424,992
Square footage of owned real estate properties \| ft²					14,500,000
Square footage of real estate acquired \| ft²					179,361
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
Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 190,000	206,000
Effective interest rate (percent)					1.61%
Medium-term Notes [Member] \| Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 199,374	199,257
Effective interest rate (percent)					1.66%
Senior Notes [Member] \| Senior Notes due 2021, net of discount and issuance costs [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 396,816	396,489
Effective interest rate (percent)					5.97%
Senior Notes [Member] \| Senior Notes due 2023, net of discount and issuance costs [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 247,096	246,897
Effective interest rate (percent)					3.95%
Senior Notes [Member] \| Senior Notes due 2025, net of discount and issuance costs [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 247,709	247,602
Effective interest rate (percent)					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]
Long-term Debt					$ 133,744	$ 128,747
Effective interest rate (percent)					5.17%
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] \| 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
Subsequent Event [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Repayment of loan								$ 190,000
Commitment fee percentage (percent)	0.20%
Upfront lender fees	$ 4,400
Borrowings outstanding							$ 0
Remaining borrowing capacity							$ 700,000
Subsequent Event [Member] \| Medium-term Notes [Member] \| Term Loan Due 2019 [Member]
Debt Instrument [Line Items]
Long-term Debt								150,000
Repayment of loan								$ 50,000
Weighted average interest rate (percent)								1.60%
London Interbank Offered Rate (LIBOR) [Member] \| Subsequent Event [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Margin rate (percent)	1.00%
Minimum [Member] \| Subsequent Event [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] \| Subsequent Event [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Margin rate (percent)	0.83%
Maximum [Member] \| Subsequent Event [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] \| Subsequent Event [Member] \| Line of Credit [Member] \| Unsecured Credit Facility Due 2017 [Member]
Debt Instrument [Line Items]
Margin rate (percent)	1.55%