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Notes Payable (Summary Of Indebtedness) (Details) - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Unsecured notes payable

$ 1,583,819

$ 1,583,236

Secured notes payable

^[1]

866,476

897,352

Total notes payable

2,450,300

2,480,600

Senior Unsecured Notes [Member]

Unsecured notes payable

^[1]

$ 1,583,800

$ 1,583,200

5.83% Notes Due 2017 [Member] | Senior Unsecured Notes [Member]

Debt Instrument, Maturity Date

May 15, 2017

Notes payable, effective interest rate

5.83%

5.83%

Unsecured notes payable

$ 246,700

$ 246,600

4.78% Notes Due 2021 [Member] | Senior Unsecured Notes [Member]

Debt Instrument, Maturity Date

Jun. 15, 2021

Notes payable, effective interest rate

4.78%

4.78%

Unsecured notes payable

$ 248,500

$ 248,400

3.15% Notes Due 2022 [Member] | Senior Unsecured Notes [Member]

Debt Instrument, Maturity Date

Dec. 15, 2022

Notes payable, effective interest rate

3.15%

3.15%

Unsecured notes payable

$ 346,100

$ 346,000

5.07% Notes Due 2023 [Member] | Senior Unsecured Notes [Member]

Debt Instrument, Maturity Date

Jun. 15, 2023

Notes payable, effective interest rate

5.07%

5.07%

Unsecured notes payable

$ 247,300

$ 247,200

4.36% Notes Due 2024 [Member] | Senior Unsecured Notes [Member]

Debt Instrument, Maturity Date

Jan. 15, 2024

Notes payable, effective interest rate

4.36%

4.36%

Unsecured notes payable

$ 248,300

$ 248,200

3.68% Notes Due 2024 [Member] | Senior Unsecured Notes [Member]

Debt Instrument, Maturity Date

Sep. 15, 2024

Notes payable, effective interest rate

3.68%

3.68%

Unsecured notes payable

$ 246,900

$ 246,800

Secured Notes 1.37% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] | Secured Debt [Member]

Secured notes payable

866,500

866,700

Tax-exempt Mortgage Note [Member] | Secured Debt [Member]

Secured notes payable

^[2]

0

30,700

Secured Notes 1.37% Floating Rate [Member] | Secured Debt [Member]

Secured notes payable

$ 175,000

$ 175,000

Minimum [Member] | Secured Notes 1.37% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] | Secured Debt [Member]

Debt Instrument, Maturity Date

Oct. 01, 2018

Notes payable, effective interest rate

1.37%

Minimum [Member] | Secured Notes 1.37% Floating Rate [Member] | Secured Debt [Member]

Notes payable, effective interest rate

1.37%

Maximum [Member] | Secured Notes 1.37% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] | Secured Debt [Member]

Debt Instrument, Maturity Date

Sep. 01, 2045

Notes payable, effective interest rate

5.77%

[1]	Unamortized debt discounts and debt issuance costs of $14.4 million and $15.7 million are included in senior unsecured and secured notes payable as of March 31, 2017 and December 31, 2016, respectively.
[2]	Due initially in 2028; however, this secured notes payable was repaid in February 2017. See below for further discussion.

X

- 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=64930785&loc=d3e28551-108399

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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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
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