Document And Entity Information [Abstract]
Document and Entity Information.
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Filer Category
Entity Filer Category
Document Type
Document Type
Document Period End Date
Document Period End Date
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Amendment Flag
Amendment Flag
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Equity Method Investments and Joint Ventures [Abstract]
Investments in Joint Ventures
Equity Method Investments and Joint Ventures Disclosure [Text Block]
Increase (Decrease) in Operating Capital [Abstract]
Other assets, net
Increase (Decrease) in Other Operating Assets
Accounts payable and accrued expenses
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Accrued real estate taxes
Increase (Decrease) in Property and Other Taxes Payable
Other liabilities
Increase (Decrease) in Other Operating Liabilities
Other
Other Noncash Income (Expense)
Change in operating accounts and other
Increase (Decrease) in Operating Capital
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments and Hedging Activities Disclosure [Text Block]
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Property, Plant and Equipment [Abstract]
Disposal Groups, Including Discontinued Operations [Table]
Disposal Groups, Including Discontinued Operations [Table]
Disposal Group Classification [Axis]
Disposal Group Classification [Axis]
Disposal Group Classification [Domain]
Disposal Group Classification [Domain]
Long Lived Assets Held-for-sale by Asset Type [Axis]
Long Lived Assets Held-for-sale by Asset Type [Axis]
Long Lived Assets Held-for-sale, Name [Domain]
Long Lived Assets Held-for-sale, Name [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fair Value Disclosures [Abstract]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Income Tax Disclosure [Abstract]
Annual dividends distribution percentage to shareholders to qualify as a REIT
Annual Dividend Distribution Percentage To Shareholders To Qualify As Real Estate Investment Trust
As a Real Estate Investment Trust (REIT), we are required to distribute annual dividends to shareholders to qualify as a REIT equal to a minimum percentage of 90% of REIT taxable income, computed without regard to the dividends paid deduction and net capital gains.
Significant temporary differences or tax credits associated with our taxable REIT subsidiaries
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Domestic Subsidiaries
Uncertain tax positions or unrecognized tax benefits
Unrecognized Tax Benefits
Statement of Cash Flows [Abstract]
Statement [Table]
Statement [Table]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
Statement [Line Items]
Statement [Line Items]
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Adjustments to reconcile net income to net cash from operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation and amortization
Depreciation, Depletion and Amortization
Loss on early retirement of debt
Gain (Loss) on Extinguishment of Debt
Distributions of income from joint ventures
Proceeds from Equity Method Investment, Distribution
Equity in income of joint ventures
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions
Share-based compensation
Share-based Compensation
Net change in operating accounts and other
Other Operating Activities, Cash Flow Statement
Net cash from operating activities
Net Cash Provided by (Used in) Operating Activities
Cash flows from investing activities
Net Cash Provided by (Used in) Investing Activities [Abstract]
Development and capital improvements
Payments to Develop Real Estate Assets
Acquisition of operating property
Payments to Acquire Real Estate
Maturities of short-term investments
Proceeds from Short-term Debt, Maturing in Three Months or Less
Increase in non-real estate assets
Payments to Acquire Other Property, Plant, and Equipment
Other
Payments for (Proceeds from) Other Investing Activities
Net cash from investing activities
Net Cash Provided by (Used in) Investing Activities
Cash flows from financing activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
Borrowings on unsecured credit facility and other short-term borrowings
Proceeds from Lines of Credit
Repayments on unsecured credit facility and other short-term borrowings
Repayments of Lines of Credit
Repayment of notes payable
Repayments of Notes Payable
Distributions to common shareholders and non-controlling interests
Payments of Dividends
Other
Proceeds from (Payments for) Other Financing Activities
Net cash from financing activities
Net Cash Provided by (Used in) Financing Activities
Net increase (decrease) in cash, cash equivalents, and restricted cash
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Total cash, cash equivalents, and restricted cash, beginning of year
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Total cash, cash equivalents, and restricted cash, end of period
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Restricted cash
Restricted Cash and Cash Equivalents
Total cash, cash equivalents, and restricted cash
Supplemental information
Supplemental Cash Flow Information [Abstract]
Cash paid for interest, net of interest capitalized
Interest Paid, Net
Cash paid for income taxes
Income Taxes Paid
Supplemental schedule of noncash investing and financing activities
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Distributions declared but not paid
Dividends
Value of shares issued under benefit plans, net of cancellations
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options
Accrual associated with construction and capital expenditures
Accrual associated with construction and capital expenditures
Non-cash accrual associated with construction and capital expenditures and additions to retainage.
Revenues [Abstract]
Revenues
Revenue Recognition, Leases [Policy Text Block]
Revenue Recogition, New Accounting Pronouncement, Description
New Accounting Pronouncement or Change in Accounting Principle, Description
Share-based Compensation [Abstract]
Schedule of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value
Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value [Table Text Block ]
Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and aggregate intrinsic value.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Summary of Share Incentive Plans
Share-based Compensation, Activity [Table Text Block]
Summary of non-qualified deferred compensation share award activity
Temporary Equity [Table Text Block]
Investments in Joint Ventures [Abstract]
Investments in Joint Ventures.
Total assets
Equity Method Investment, Summarized Financial Information, Assets
Total third-party debt
Equity Method Investment, Summarized Financial Information, Liabilities
Total equity
Equity Method Investment, Summarized Financial Information, Equity Excluding Noncontrolling Interests
Total revenues
Equity Method Investment, Summarized Financial Information, Revenue
Net income
Equity Method Investment, Summarized Financial Information, Net Income (Loss)
Equity in income (1)
Income Statement [Abstract]
Property revenues
Real Estate Revenue, Net [Abstract]
Rental revenues
Operating Leases, Income Statement, Minimum Lease Revenue
Other property revenues
Other Real Estate Revenue
Total property revenues
Real Estate Revenue, Net
Property expenses
Cost of Real Estate Revenue [Abstract]
Property operating and maintenance
Direct Costs of Leased and Rented Property or Equipment
Real estate taxes
Real Estate Tax Expense
Total property expenses
Cost of Real Estate Revenue
Non-property income
Nonoperating Income (Expense) [Abstract]
Fee and asset management
Management Fees Revenue
Interest and other income
Interest and Other Income
Income on deferred compensation plans
Income (Loss) On Deferred Compensation Plans
This item represents the income (loss) on our deferred compensation plans included in earnings for the period as a result of holding marketable securities categorized as trading. Gross presentation is based on principal vs. agent accounting for revenues as the company is the principal and gains control of the assets from the deferred compensation plan before transferring the assets to the employees and the company's performance obligation is to provide the assets to the employees.
Total non-property income
Total Non Property Income Loss
Total non-property income (loss). Includes fee and asset management income, interest and other income, net and income (loss) on deferred compensation plans.
Other expenses
Other Expenses [Abstract]
Property management
Owned Property Management Costs
Fee and asset management
Asset Management Costs
General and administrative
General and Administrative Expense
Interest
Interest Expense
Depreciation and amortization
Depreciation, Depletion and Amortization, Nonproduction
Expense on deferred compensation plans
Expense (Benefit) On Deferred Compensation Plans
This item represents the expense (benefit) on our deferred compensation plans included in earnings for the period as a result of holding marketable securities categorized as trading. Gross presentation is based on principal vs. agent accounting for revenues as the company is the principal and gains control of the assets from the deferred compensation plan before transferring the assets to the employees and the company's performance obligation is to provide the assets to the employees.
Total other expenses
Total Other Expenses
This element represents a sum total of property management, fee and asset management, general and administrative, interest, depreciation and amortization, amortization of deferred financing costs, and expense (benefit) on deferred compensation plans.
Loss on early retirement of debt
Equity in income of joint ventures
Income from continuing operations before income taxes
Income (Loss) from Continuing Operations before Income Taxes, Domestic
Income tax expense
Current Income Tax Expense (Benefit)
Less income allocated to non-controlling interests from continuing operations
Net Income (Loss) Attributable to Noncontrolling Interest
Net income attributable to common shareholders
Net Income (Loss) Attributable to Parent
Earnings per share – basic
Earnings Per Share, Basic
Earnings per share – diluted
Earnings Per Share, Diluted
Distributions declared per common share
Common Stock, Dividends, Per Share, Declared
Weighted average number of common shares outstanding – basic
Weighted Average Number of Shares Outstanding, Basic
Weighted average number of common shares outstanding – diluted
Weighted Average Number of Shares Outstanding, Diluted
Condensed Consolidated Statements of Comprehensive Income
Statement of Comprehensive Income [Abstract]
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized gain on cash flow hedging activities
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Reclassification of net loss on cash flow hedging activities, prior service cost and net loss on post-retirement obligation
Reclassification of net loss on cash flow hedging activities, prior service cost and net loss on post retirement obligation
The amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss), combined with the net loss (gain) previously recognized as a component of net periodic benefit costs for the period and the amount of the prior service cost or (credit) recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or plan initiation.
Comprehensive income
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Comprehensive income attributable to common shareholders
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Accounting Policies [Abstract]
Principles of Consolidation
Consolidation, Policy [Policy Text Block]
Interim Financial Reporting
Interim Financial Reporting, Policy [Text Block]
Describes an entity's accounting policy for interim financial reporting.
Acquisitions of Real Estate
Acquisitions of Real Estate [Policy Text Block]
Acquisitions of Real Estate [Policy Text Block]
Asset Impairment
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Cost Capitalization
Property, Plant and Equipment, Policy [Policy Text Block]
Derivatives Financial Instruments
Derivatives, Policy [Policy Text Block]
Fair Value
Fair Value of Financial Instruments, Policy [Policy Text Block]
Notes Receivable
Loans, Notes, Trade and Other Receivables Disclosure [Text Block]
Recent Accounting Pronouncements
New Accounting Pronouncements, Policy [Policy Text Block]
Share-Based Compensation and Non-Qualified Deferred Compensation [Abstract]
Share-Based Compensation and Non-Qualified Deferred Compensation [Abstract]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Minimum [Member]
Minimum [Member]
Maximum [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Description of Business [Abstract]
Description of Business [Abstract]
Description of Business
Nature of Operations [Text Block]
Stockholders' Equity Note [Abstract]
Share Repurchase Program [Axis]
Share Repurchase Program [Axis]
Share Repurchase Program [Domain]
Share Repurchase Program [Domain]
April 2007 Repurchase Plan [Member]
April 2007 Repurchase Plan [Member]
April 2007 Repurchase Plan [Member]
Share Offering Program [Axis]
Share Offering Program [Axis]
Share Offering Program [Axis]
Share Offering Program [Domain]
Share Offering Program [Domain]
Share Offering Program [Domain]
2014 ATM program [Member]
2014 ATM program [Member]
2014 ATM program [Member]
2017 ATM program [Member]
2017 ATM program [Member]
2017 ATM program [Member]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Axis]
Long-term Debt, Type [Domain]
Long-term Debt, Type [Domain]
Unsecured Credit Facility [Member]
Line of Credit [Member]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Subsequent Event [Member]
Subsequent Event [Member]
Common shares repurchased
Treasury Stock, Value, Acquired, Par Value Method
Maximum aggregate offering price of remaining common shares available for sale
Maximum aggregate offering price of remaining common shares available for sale
Maximum aggregate offering price of common shares under the at-the-market share offering program available for sale.
Line of Credit Facility, Current Borrowing Capacity
Line of Credit Facility, Current Borrowing Capacity
Maximum aggregate offering price of common shares
Maximum aggregate offering price of common shares
Maximum aggregate offering price of common shares under the at-the-market share offering program.
Treasury stock allowed for repurchase
Stock Repurchase Program, Authorized Amount
Treasury Stock, Shares, Acquired
Treasury Stock, Shares, Acquired
Share Repurchase Program, Remaining Authorized Repurchase Amount
Stock Repurchase Program, Remaining Authorized Repurchase Amount
Number of common and preferred stock authorized to issue
Shares Authorized
The maximum number of common shares and nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.
Common shares, authorized
Common Stock, Shares Authorized
Preferred shares, authorized
Preferred Stock, Shares Authorized
Common Stock, Shares, Outstanding
Common Stock, Shares, Outstanding
Preferred Stock, Shares Outstanding
Preferred Stock, Shares Outstanding
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping [Table]
Fixed rate notes payable
Fixed Rate Notes Payable [Member]
Fixed Rate Notes Payable [Member]
Floating rate notes payable (1)
Floating Rate Notes Payable [Member]
Floating Rate Notes Payable [Member]
Carrying Value
Notes Payable
Estimated Fair Value
Notes Payable, Fair Value Disclosure
Commitment and Contingencies
Commitment And Contingencies [Table]
Commitment and contingencies [Table]
Consolidated Entities [Axis]
Consolidated Entities [Axis]
Consolidated Entities [Domain]
Consolidated Entities [Domain]
Partnership Interest [Member]
Partnership Interest [Member]
Number of consolidated projects under construction
Number of consolidated projects under construction
Number of consolidated projects under construction
Anticipated expenditures relating to completion of construction type contracts
Anticipated Expenditures Relating To Completion Of Construction Type Contracts
General description of anticipated expenditures which may be required in performing under a construction-type contract at the balance sheet date.
Earnest Money Deposits
Earnest Money Deposits
Increase (Decrease) in Earnest Money Deposits Outstanding
Increase (Decrease) in Earnest Money Deposits Outstanding
Rental expense
Operating Leases, Rent Expense
Minimum annual rental commitments, remainder of 2018
Operating Leases, Future Minimum Payments Due, Next Twelve Months
Minimum annual rental commitments, 2019
Operating Leases, Future Minimum Payments, Due in Two Years
Minimum annual rental commitments, 2020
Operating Leases, Future Minimum Payments, Due in Three Years
Minimum annual rental commitments, 2021
Operating Leases, Future Minimum Payments, Due in Four Years
Minimum annual rental commitments, 2022
Operating Leases, Future Minimum Payments, Due in Five Years
Minimum annual rental commitments, thereafter
Operating Leases, Future Minimum Payments, Due Thereafter
Less than joint venture economic interest noted
Economic Interest In Joint Ventures
Economic interest in the community or land owned directly by the joint venture or partnership is less than this amount in order to qualify as a joint venture or partnership.
Statement of Financial Position [Abstract]
Common shares, par value, per share
Common Stock, Par or Stated Value Per Share
Common shares, issued
Common Stock, Shares, Issued
Common shares, outstanding
Common Shares Outstanding Including Treasury Shares
Total number of shares of common stock held by shareholders (excluding shares held in our deferred compensation arrangements), including treasury stock. May be all or a portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders.
Treasury shares, at cost
Treasury Stock, Shares
Financial Assets And Liabilities Measured At Fair Value
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Fair Value Of Notes Payable
Fair Value Of Notes Receivable And Notes Payable Table Text Block
Fair Value Of Notes Receivable And Notes Payable.
Schedule of Business Acquisitions, by Acquisition [Table]
Schedule of Business Acquisitions, by Acquisition [Table]
Name of Property [Axis]
Name of Property [Axis]
Name of Property [Domain]
Name of Property [Domain]
Camden Pier District [Member]
Camden Pier District [Member]
Camden Pier District [Member]
Camden North Quarter [Member]
Camden North Quarter [Member]
Camden North Quarter [Member]
Camden Buckhead Square [Member]
Camden Buckhead Square [Member]
Camden Buckhead Square [Member]
Legal Entity [Axis]
Legal Entity [Axis]
Entity [Domain]
Entity [Domain]
Number of Operating properties Acquired
Number of Operating properties Acquired
Number of operating properties acquired which are now fully consolidated during the period.
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest
Area of Land
Area of Land
Payments to Acquire Land
Payments to Acquire Land
Number of Units in Real Estate Property
Number of Units in Real Estate Property
Purchase Price of Operating Properties Acquired
Notes Payable [Abstract]
Maturities Due In 2018 [Member]
Maturities Due In 2018 [Member]
Maturities Due In 2018 [Member]
Maturities Due In 2019 [Member]
Maturities Due In 2019 [Member]
Maturities Due In 2019 [Member]
Maturities Due In 2020 [Member]
Maturities Due In 2020 [Member]
Maturities Due In 2020 [Member]
Maturities due in 2021 [Member]
Maturities due in 2021 [Member]
Maturities due in 2021 [Member]
Maturities due in 2022 [Member]
Maturities due in 2022 [Member]
Maturities due in 2022 [Member]
Maturities Due Thereafter [Member]
Maturities Due Thereafter [Member]
Maturities Due Thereafter [Member]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Short-term Debt, Type [Domain]
Short-term Debt, Type [Domain]
2018
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months
2019
Long-term Debt, Maturities, Repayments of Principal in Year Two
2020
Long-term Debt, Maturities, Repayments of Principal in Year Three
2021
Long-term Debt, Maturities, Repayments of Principal in Year Four
2022
Long-term Debt, Maturities, Repayments of Principal in Year Five
Thereafter
Long-term Debt, Maturities, Repayments of Principal after Year Five
Total notes payable
Long-term Debt
Weighted Average Interest Rate
Debt, Weighted Average Interest Rate
Acquisitions, Dispositions, Assets Held For Sale and Impairment [Text Block]
Acquisitions, Dispositions, Assets Held For Sale and Impairment [Text Block]
The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, and assets held for sale. The tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregated would be included in this disclosure. Additionally, the entire disclosure for the facts and circumstances leading to the completed or expected disposal, manner and timing of disposal, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss), the segment in which the disposal group was reported, and the classification (whether sold or classified as held for sale) and carrying value of the assets and liabilities comprising the disposal group. Includes all disposal groups, including those classified as components of the entity.
Class of Stock [Axis]
Class of Stock [Axis]
Class of Stock [Domain]
Class of Stock [Domain]
Assets
Assets [Abstract]
Land
Land
Buildings and improvements
Investment Building and Building Improvements
Real estate assets, at cost, total
Real estate assets, at cost, total
The value of land and buildings and improvement before accumulated depreciation.
Accumulated depreciation
Real Estate Investment Property, Accumulated Depreciation
Net operating real estate assets
Net operating real estate assets
The net book value of land and buildings and improvement.
Properties under development, including land
Properties under development including land
The current amount of expenditures for a real estate project that has not yet been completed including the carrying amount of
land available for development.
Investments in joint ventures
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Total real estate assets
Real Estate Assets Total
Total net real estate assets, including investments in joint ventures.
Accounts receivable – affiliates
Accounts Receivable, Related Parties
Other assets, net
Other Assets
Cash and cash equivalents
Total assets
Assets
Liabilities and equity
Liabilities and Equity [Abstract]
Liabilities
Liabilities [Abstract]
Unsecured notes payable
Unsecured Debt
Secured notes payable
Secured Debt
Accounts payable and accrued expenses
Accounts Payable and Accrued Liabilities
Accrued real estate taxes
Accrual for Taxes Other than Income Taxes
Distributions payable
Distributions payable
Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding, in addition to distributions due to real estate partnerships.
Other liabilities
Other Liabilities
Total liabilities
Liabilities
Commitments and contingencies (Note 12)
Commitments and Contingencies
Non-qualified deferred compensation share awards
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests
Equity
Stockholders' Equity Attributable to Parent [Abstract]
Common shares of beneficial interest; $0.01 par value per share; 175,000 shares authorized; 105,494 and 105,489 issued; 102,644 and 102,769 outstanding at June 30, 2018 and December 31, 2017, respectively
Common Stocks Value Outstanding
Value of all classes of common stock held by shareholders (excluding shares held in our deferred compensation arrangements); including treasury stock. May be all or a portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders.
Additional paid-in capital
Additional Paid in Capital, Common Stock
Distributions in excess of net income attributable to common shareholders
Accumulated Distributions in Excess of Net Income
Treasury shares, at cost (9,839 and 10,073 common shares at June 30, 2018 and December 31, 2017, respectively)
Treasury Stock, Value
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total common equity
Stockholders' Equity Attributable to Parent
Non-controlling interests
Stockholders' Equity Attributable to Noncontrolling Interest
Total equity
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Total liabilities and equity
Liabilities and Equity
Balance at December 31, 2017
Change in classification
Change in classification of deferred compensation plan
The value of share awards reclassed from additional paid in capital into temporary equity following amendment of the Non-Qualified Deferred Compensation plan permitting diversification of awards into other equity securities subject to a six month holding period and at the holders’ option.
Change in redemption value
Temporary Equity, Carrying Amount, Period Increase (Decrease)
Diversification of share awards
Diversification of share awards within deferred compensation plan (Equity)
Non-qualified share awards diversified into other equity securities during the period.
Balance at June 30, 2018
Plan Name [Axis]
Plan Name [Axis]
Plan Name [Domain]
Plan Name [Domain]
2018 Share Incentive Plan
Two Thousand Eighteen Share Incentive Plan [Member]
Two Thousand Eighteen Share Incentive Plan [Member]
Award Type [Axis]
Award Type [Axis]
Award Type [Domain]
Equity Award [Domain]
Employee Stock Option [Member]
Employee Stock Option [Member]
Share Awards and Vesting [Member]
Share Awards And Vesting [Member]
Share Awards and Vesting [Member]
Employee Share Purchase Program maximum shares available
Employee Share Purchase Program maximum shares available
Employee Share Purchase Program maximum shares available under the 2018 ESPP Share plan
Percentage Of Market Value at Which Shares Purchased Under Employee Share Purchase Plan
Percentage Of Market Value at Which Shares Purchased Under Employee Share Purchase Plan
The percentage of market value per share at which shares may be purchased under our employee share purchase plan.
Allocated Share-based Compensation Expense
Allocated Share-based Compensation Expense
Total common shares available
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
New common shares available under the 2018 Share Plan
Number Of Fungible Unit Authorized To Issue Under Share Based Compensation Plan
Shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable, specifically for the 2011 Share Plan, which superseded the 2002 Share Plan.
Shares transferred from the 2011 Share Plan to the 2018 Share Plan
Number Of Fungible Unit Authorized To Issue Under Share Based Compensation Plans
Shares reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable, specifically from the 2002 Share Plan, which has been superseded by the 2011 Share Plan.
Common shares subject to awards outstanding under 2011 Share Plan
Common shares subject to awards outstanding
Common shares subject to restricted share and restricted share unit awards outstanding under the 2011 plan (subject to a 3.45 multiplier)
Common shares subject to options under the 2011 share plan
Common shares subject to options under the 2011 share plan
Common shares subject to options granted under the 2011 share plan
Common shares subject to 2011 Share Plan awards
Common shares subject to 2011 Share Plan awards
Common shares subject to 2011 Share Plan awards which may in the future become available under the 2018 Share Plan
Shares To Full Value Award Conversion Ratio
Fungible Units To Full Value Award Conversion Ratio
The award conversion ratio regarding the shares from the 2002 share incentive plan transferred into the 2011 share incentive plan.
Value Of Option Right Or Other Award In The Fungible Unit Conversion
Value Of Option Right Or Other Award In The Fungible Unit Conversion
An option, right, or other award which does not deliver the full value at date of grant and expires five years or less from the date of grant counts against the Fungible Pool Limit as this portion of a fungible pool unit
Full Value award in the share conversion ratio
Full Value award in the fungible unit conversion ratio
The full value award in the fungible unit to full value award conversion ratio regarding the shares from the 2002 share incentive plan transferred into the 2011 share incentive plan.
Shares which could be granted pursuant to full value awards
Common Shares Which Could Be Granted Pursuant To Full Value Awards
Common shares which could be granted pursuant to full value awards based on the 3.45 to 1.0 fungible unit-to-full value award conversion ratio.
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage
Options exercised during the period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Intrinsic value of options exercised during the period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value
Remaining weighted average contractual life (years) exercisable options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross
Vesting period, years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Total unrecognized compensation cost which is expected to be amortized
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized
Expected amortized period of unrecognized compensation expected to be recognized for share-based compensation plans
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition
Fair value of shares vested
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Total compensation cost for option and share awards
Share Based Compensation Arrangement By Share Based Payment Award Compensation Cost For Period
Equity-based compensation cost during the period with respect to the award, which was recognized in income.
Total capitalized compensation cost for option and share awards
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Employee Share Purchase Plan, Maximum Authorized Amount Per Participant
Employee Share Purchase Plan, Maximum Authorized Amount Per Participant
Maximum authorized purchase amount of shares during any plan year per participant for our employee share purchase plan.
New Accounting Pronouncements or Change in Accounting Principle [Table]
New Accounting Pronouncements or Change in Accounting Principle [Table]
Net Below Market Leases [Axis]
Net Below Market Leases [Axis]
Net Below Market Leases [Axis]
Net Below Market Leases [Domain]
Net Below Market Leases [Domain]
[Domain] for Net Below Market Leases [Axis]
Net Below Market Leases [Member]
Net Below Market Leases [Member]
Net Below Market Leases [Member]
In-place leases [Axis]
In-place leases [Axis]
In-place leases [Axis]
In-place leases [Domain]
In-place leases [Domain]
[Domain] for In-place leases [Axis]
In Place Leases [Member]
In Place Leases [Member]
In Place Leases [Member]
Camden Summit Partnership L P [Member]
Camden Summit Partnership L P [Member]
Camden Summit Partnership LP [Member]
Camden Operating L P [Member]
Camden Operating L P [Member]
Camden Operating LP [Member]
Income Statement Location [Axis]
Income Statement Location [Axis]
Income Statement Location [Domain]
Income Statement Location [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization of Intangible Assets
Amortization of Intangible Assets
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life
Outstanding common limited partnership units, ownership interest
Limited Liability Company or Limited Partnership, Members or Limited Partners, Ownership Interest
General Partner of Consolidated Operating Partnerships, Ownership Interest
Capitalized interest
Interest Costs Capitalized
Capitalized real estate taxes
Capitalized Real Estate Taxes
The amount of real estate or property taxes that were capitalized during the period.
Outstanding notes receivable
Mortgage Loans on Real Estate, Carrying Amount of Mortgages
Weighted average interest rate on outstanding notes receivable
Mortgage Loans on Real Estate, Interest Rate
Aggregate Balance Sheet And Statement Of Income Data For Unconsolidated Joint Ventures
Equity Method Investments [Table Text Block]
Earnings Per Share [Abstract]
Calculation Of Basic And Diluted Earnings Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Schedule of Long-term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Short-term Debt [Member]
Short-term Debt [Member]
4.78% Notes Due 2021 [Member]
Four Point Seven Eight Percentage Notes Due2021 [Member]
Four Point Seven Eight Percentage Notes Due2021
3.15% Notes Due 2022 [Member]
Three Point One five Percentage Notes Due 2022 [Member]
Three Point One five Percentage Notes Due 2022
5.07% Notes Due 2023 [Member]
Five Point Zero Seven Percentage Notes Due 2023 [Member]
Five Point Zero Seven Percentage Notes Due 2023
4.36% Notes Due 2024 [Member]
Four Point Three Six Percentage Notes Due 2024 [Member]
Four Point Three Six Percentage Notes Due 2024
3.68% Notes Due 2024 [Member]
Three Point Six Eight Percentage Notes Due 2024 [Member]
Three Point Six Eight Percentage Notes Due 2024
Secured Notes 2.62% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member]
Secured Notes 1.92% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member]
Secured Notes 1.92% to 5.77% Conventional Mortgage Notes Due 2018 to 2045
Secured Notes 2.62% Floating Rate [Member]
Secured Notes 1.26% Floating Rate [Member]
Secured Notes 1.26% Floating Rate
Debt Instrument [Axis]
Debt Instrument [Axis]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Commercial Banks [Member]
Commercial Banks [Member]
Commercial Banks.
Senior Unsecured Notes [Member]
Senior Unsecured Notes [Member]
Senior unsecured notes.
Secured Debt [Member]
Secured Debt [Member]
Debt Instrument, Maturity Date
Debt Instrument, Maturity Date
Notes payable, effective interest rate
Debt Instrument, Interest Rate, Effective Percentage
Other Short-term Borrowings
Other Short-term Borrowings
Total notes payable
Income Taxes
Income Tax Disclosure [Text Block]
Summary of Significant Accounting Policies and Recent Accounting Pronouncements
Basis of Presentation and Significant Accounting Policies [Text Block]
Floating rate notes payable [Member]
Letter Of Credit [Member]
Letter of Credit [Member]
Unamortized debt discounts and debt issuance costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Unsecured Credit Facility, Current Borrowing Capacity
Unsecured Credit Facility, Expiration Date
Line of Credit Facility, Expiration Date
Optional extension period of unsecured credit facility
Option to extend the period of unsecured credit facility
Option to extend the period of unsecured credit facility.
Maximum borrowing capacity under unsecured credit facility
Line of Credit Facility, Maximum Borrowing Capacity
Debt Instrument, Basis Spread on Variable Rate
Debt Instrument, Basis Spread on Variable Rate
Maximum term of bid rate loans (days)
Terms Of Bid Rate Loans
Maximum term of bid rate loans in days related to the line of credit. Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates
Lesser of amount stated or the amount available under the unsecured credit facility
Value not exceeding the amount available under the line of credit
Advances under the line of credit may be priced at the scheduled rates, or we may enter into bid rate loans with participating banks at rates below the scheduled rates. These bid rate loans have terms of 180 days or less and may not exceed the lesser of $250 million or the remaining amount available under the line of credit.
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility
Maximum Ability to Issue Letters of Credit Under Unsecured Credit Facility
Unsecured Debt
Outstanding balance under credit facility
Long-term Line of Credit
Available amount under unsecured credit facility
Line of Credit Facility, Remaining Borrowing Capacity
Notes payable
Weighted average maturity of indebtedness (including unsecured line of credit) (in years)
Weighted Average Maturity Of Indebtedness Including Unsecured Line Of Credit
Weighted Average Maturity Of Indebtedness Including Unsecured Line Of Credit
Net Change in Operating Accounts
Effect Of Changes In The Operating Accounts On Cash Flows From Operating Activities [Text Block]
Entire disclosure of the net increase (decrease) in operating capital in the operating section of the statement of cash flows, and represents the entire footnote disclosure that provides details regarding the net change during the reporting period of all assets and liabilities used in operating activities.
Schedule of Equity Method Investments [Table]
Schedule of Equity Method Investments [Table]
Non-consolidated entity [Axis]
nonconsolidated entity [Axis]
nonconsolidated entity [Axis]
nonconsolidated entity [Domain]
nonconsolidated entity [Domain]
[Domain] for nonconsolidated entity [Axis]
Schedule of Equity Method Investments [Line Items]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage
Equity Method Investment, Ownership Percentage
Number of joint ventures accounted for under equity method investments
Number of joint ventures accounted for under equity method investments
Number of joint ventures accounted for under equity method investments.
Maximum guaranteed amount of loans utilized for construction and development activities for joint ventures
Guarantor Obligations, Maximum Exposure, Undiscounted
Fees earned for property and asset management, construction, development, and other services to joint ventures
Fees Earned For Property And Asset Management Construction Development And Other Services To Joint Ventures
Revenue earned by providing property management, construction, development, and other services to joint ventures.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding Options, Number At December 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options
Granted, Options Outstanding
Exercised/Vested, Options Outstanding
Forfeited, Options Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Outstanding Options, Number At June 30, 2018
Options outstanding at December 31, 2017, Weighted Average Exercise/Grant Price
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price
Granted, Weighted Average Exercise/Grant Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Exercised/Vested, Weighted Average Exercise/Grant Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Forfeited, Weighted Average Exercise/Grant Price
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Options outstanding at June 30, 2018, Weighted Average Exercise/Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested share awards outstanding at December 31, 2017, Share Awards Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Granted, Share Awards Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Exercised/Vested, Share Awards Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Forfeited, Share Awards Outstanding
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Nonvested share awards outstanding at June 30, 2018, Share Awards Outstanding
Nonvested share awards outstanding at December 31, 2017, Weighted Average Exercise/Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Granted, Weighted Average Exercise/Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Exercised/Vested, Weighted Average Exercise/Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Forfeited, Weighted Average Exercise/Grant Price
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Nonvested share awards outstanding at June 30, 2018, Weighted Average Exercise/Grant Price
Number of common share equivalent securities excluded from the diluted earnings per share calculation
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Income from continuing operations attributable to common shareholders
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent
Amount allocated to participating securities
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic
Net income attributable to common shareholders – basic
Net Income (Loss) Available to Common Stockholders, Basic
Total earnings per common share – basic
Income Loss From Continuing Operations After Adjustment for Amount Allocated To Participating Securities
Income Loss From Continuing Operations After Adjustment for Amount Allocated To Participating Securities
This element represents the income or loss from continuing operations attributable to the parent which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any, less the earnings allocated (not distributed) to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed.
Income allocated to common units from continuing operations
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities
Net income attributable to common shareholders – diluted
Net Income (Loss) Available to Common Stockholders, Diluted
Total earnings per common share – diluted
Common share options and share awards granted
Common share options and share awards granted
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method and incremental common shares attributable to participating nonvested shares with non-forfeitable dividend rights using the two class method.
Common units
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock
Weighted average number of common shares outstanding – diluted
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Contract [Domain]
Derivative Contract [Domain]
Interest Rate Swap [Member]
Interest Rate Swap [Member]
Fair Value, Hierarchy [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Level 3 [Member]
Fair Value, Inputs, Level 3 [Member]
Deferred compensation plan investments (1)
Deferred Compensation Plan Assets
Participant Withdrawals From Deferred Compensation Plan Investments
Participant Withdrawals From Deferred Compensation Plan Investments
Participant withdrawals from deferred compensation plan investments
Diversification of share awards within deferred compensation plan
Interest Rate Derivative Assets, at Fair Value
Interest Rate Derivative Assets, at Fair Value
Interest Rate Derivative Liabilities, at Fair Value
Interest Rate Derivative Liabilities, at Fair Value
Property Acquisitions, Discontinued Operations, and Assets Held For Sale [Abstract]
Property Acquisitions, Discontinued Operations, and Assets Held For Sale [Abstract]
Unrealized Gain on Cash Flow Hedging Activities [Abstract]
Unrealized Gain on Cash Flow Hedging Activities [Abstract]
Unrealized Gain (Loss) on Investments [Table Text Block]
Unrealized Gain (Loss) on Investments [Table Text Block]
Derivative Instruments, Gain (Loss) [Table]
Derivative Instruments, Gain (Loss) [Table]
Interest Rate Cap [Member]
Interest Rate Cap [Member]
Other Comprehensive Income Location [Axis]
Other Comprehensive Income Location [Axis]
Other Comprehensive Income Location [Domain]
Other Comprehensive Income Location [Domain]
Hedging Designation [Axis]
Hedging Designation [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Not Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument [Member]
Designated as Hedging Instrument [Member]
Designated as Hedging Instrument [Member]
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Cash Flow Hedging [Member]
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount
Derivative, Notional Amount
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net
Number of Interest Rate Derivatives Held
Number of Interest Rate Derivatives Held
Unrealized Gain on cash flow hedging activities
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion
Unrealized Gain (Loss) on Derivatives
Expected useful lives of depreciable property
Expected Useful Lives Of Depreciable Property Text Block
Expected useful lives of depreciable property including buildings and improvements, furniture, fixtures, equipment and other, and intangible assets such as in-place leases and above and below market leases.
Non-recurring fair value measurements [Abstract]
Non-recurring fair value measurements [Abstract]
Diversification of share awards within deferred compensation plan (Equity)
Share-based Compensation and Non-Qualified Deferred Compensation Plan
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Summary Of Indebtedness
Schedule of Long-term Debt Instruments [Table Text Block]
Scheduled Repayments On Outstanding Debt
Schedule of Maturities of Long-term Debt [Table Text Block]
Derivative Instruments and Hedging Activities Fair Value [Abstract]
Derivative Instruments and Hedging Activities Fair Value [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Notes Payable
Debt Disclosure [Text Block]
Business Acquisition [Line Items]
Business Acquisition [Line Items]
Number of multifamily properties owned, operated, or under development
Number Of Multifamily Communities
The total number of real estate properties the company owned interests in, operated, or were developing as of the balance sheet date.
Total number of apartment homes in multifamily properties
Total Number Of Apartment Homes In Multifamily Communities
The total number of units in real estate properties the company owned interests in, operated, or were developing as of the balance sheet date.
Number of multifamily properties under development
Number of Multifamily Properties Under Development
The number of real estate properties under development the company owned interests in or fully owned as of the balance sheet date.
Total Number of apartment homes in multifamily properties upon completion of development
Total Number of Apartment Homes in Multifamily Properties Upon Completion Of Development
The number of units in the real estate properties under development the company owned interests in or fully owned as of the balance sheet date which will be added upon completion of development.
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Axis]
Exercise Price Range [Axis]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]
Exercise Price $75.17 [Member]
Exercise Price seventy five point zero six [Member]
Exercise Price seventy five point zero six [Member]
Exercise Price $78.55 [Member]
Range Of Exercise Prices Forty One Point One Six To Forty Three Point Nine Four [Domain]
Range Of Exercise Prices Forty One Point One Six To Forty Three Point Nine Four [Domain]
Range Of Exercise Prices $80.89 to $85.05 [Member]
Range Of Exercise Prices Forty Eight Point Zero Two To Seventy five Point Seventeen Member [Domain] [Domain]
Range Of Exercise Prices Forty Eight Point Zero Two To Seventy five Point Seventeen Member [Domain]
Range of exercise prices, minimum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit
Range of exercise prices, maximum
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit
Outstanding and Exercisable Options, Number
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price
Aggregate intrinsic value of outstanding options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value
Aggregate Intrinsic Value of Exercisable Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value
Closing share price per share for calculation of aggregate intrinsic values
Share Price
Effect Of Changes In The Operating And Other Accounts On Cash Flows From Operating Activities
Cash Flow, Operating Capital [Table Text Block]
Statement of Stockholders' Equity [Abstract]
Statement, Equity Components [Axis]
Equity Components [Axis]
Equity Component
Equity Component [Domain]
Common shares of beneficial interest
Common Stock [Member]
Additional paid-in capital
Additional Paid-in Capital [Member]
Distributions in excess of net income
Accumulated Distributions in Excess of Net Income [Member]
Treasury shares, at cost
Treasury Stock [Member]
Accumulated other comprehensive (loss)/income
AOCI Attributable to Parent [Member]
Non-controlling interests
Noncontrolling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance
Net Income
Net Income Attributable To Common Shareholders And Noncontrolling Interests
Net income (loss) attributable to common shareholders and noncontrolling interests, excluding amounts allocated to perpetual preferred units.
Other comprehensive income
Other Comprehensive Income (Loss), Net of Tax
Net share awards
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures
Employee share purchase plan
Stock Issued During Period, Value, Employee Stock Purchase Plan
Common share options exercised
Stock Issued During Period, Value, Stock Options Exercised
Change in classification of deferred compensation plan
Change in redemption value of non-qualified share awards
Conversion of operating partnership units
Stock Issued During Period, Value, Conversion of Units
Common shares repurchased
Cash distributions declared to equity holders
Dividends, Common Stock, Cash
Other
Stockholders' Equity, Other
Ending balance
Common Shares [Abstract]
Common Shares [Abstract]
Schedule of Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Axis]
Property, Plant and Equipment, Type [Domain]
Property, Plant and Equipment, Type [Domain]
Buildings And Improvements [Member]
Building and Building Improvements [Member]
Furniture, Fixtures, Equipment, And Other [Member]
Furniture and Fixtures [Member]
Estimated Useful Life (in years)
Property, Plant and Equipment, Useful Life
Intangible assets/liabilities (in-place leases and above and below market leases)
Expected useful lives Of Intangible assets Related to in place leases and above and below market leases
Expected useful lives of intangible assets related to in-place leases and above and below market leases.
Per Share Data
Earnings Per Share [Text Block]
Common Shares [Text Block]
Stockholders' Equity Note Disclosure [Text Block]