Document And Entity Information Abstract. Document And Entity Information [Abstract] Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Document Fiscal Year Focus Document Fiscal Period Focus Current Fiscal Year End Date Entity Filer Category Entity Current Reporting Status Entity Voluntary Filers Entity Well-known Seasoned Issuer Entity Public Float Entity Common Stock, Shares Outstanding Consolidated Balance Sheets [Abstract] Consolidated Balance Sheets Assets [Abstract] Assets Investments In Storage Facilities [Abstract] Investment in storage facilities: Land Land Building, equipment, and construction in progress. Building Equipment And Construction In Progress Building, equipment, and construction in progress Building, equipment, and construction in progress Real Estate Investment Property, at Cost Cost: Ending balance Cost: Beginning balance Real estate investment property, at cost, total Total of investment in storage facilities Real Estate Investment Property, Accumulated Depreciation Less: accumulated depreciation Less: accumulated depreciation Accumulated Depreciation: Ending balance Accumulated Depreciation: Beginning balance Less: accumulated depreciation Real Estate Investment Property, Net Investment in storage facilities, net Investment in storage facilities, net Investment in storage facilities, net Cash and Cash Equivalents, at Carrying Value Cash at end of period Cash at beginning of period Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Accounts Receivable, Net Accounts Receivable, Net, Total Accounts receivable Due from Related Parties Receivable from unconsolidated joint ventures Due from Related Parties, Total Receivable from unconsolidated joint venture Equity Method Investments Investment at carrying value Investment in unconsolidated joint ventures Investment at carrying value Investments in unconsolidated joint ventures Prepaid Expense Prepaid expenses Other Assets Net carrying value at December 31, Other Assets, Total Other assets Assets Total assets Total Assets Total Assets Liabilities [Abstract] Liabilities Long-term Line of Credit Line of credit Line of credit, total Line of credit Notes Payable Unsecured term note Term notes Term notes Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities, Total Accounts payable and accrued liabilities Deferred Revenue Deferred Revenue, Ending Balance Deferred Revenue, Beginning Balance Deferred Revenue, Total Deferred revenue Interest Rate Derivative Liabilities, at Fair Value Interest rate derivatives - liability Fair value of interest rate swap agreements Secured Debt Mortgages payable Mortgages payable Mortgages payable Mortgage note, total Mortgage note, total Liabilities Total liabilities Total Liabilities Total Liabilities Redeemable Noncontrolling Interest, Equity, Common, Fair Value Ending balance noncontrolling redeemable Operating Partnership Units Beginning balance noncontrolling redeemable Operating Partnership Units Noncontrolling redeemable Operating Partnership Units at redemption value Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Shareholders' Equity Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common stock $.01 par value, 100,000,000 shares authorized, 28,952,356 shares outstanding (27,650,829 at December 31, 2010) Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Accumulated Distributions in Excess of Net Income Dividends in excess of net income Dividends in excess of net income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive loss Treasury Stock, Value Treasury stock at cost, 1,171,886 shares Treasury stock at cost, 1,171,886 shares Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Treasury stock at cost, 1,171,886 shares Stockholders' Equity Attributable to Parent Balance Balance Total Shareholders' Equity Total Shareholders' Equity Stockholders' Equity Attributable to Noncontrolling Interest Ending balance noncontrolling interests - consolidated joint venture Beginning balance noncontrolling interests - consolidated joint venture Noncontrolling interest- consolidated joint venture Noncontrolling interest- consolidated joint venture Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Ending Balance Beginning Balance Total Equity Liabilities and Stockholders' Equity Total Liabilities and Shareholders' Equity Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares Authorized Common stock, shares authorized Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Treasury Stock, Shares Treasury Stock, Shares, Ending Balance Treasury Stock, Shares, Beginning Balance Treasury stock at cost, shares Consolidated Statements Of Operations [Abstract] Consolidated Statements Of Operations Revenues [Abstract] Revenues Minimum Rents Rental income Other Operating Income Other operating income (management fees and acquisition fee income) Other operating income Other operating income Total operating revenues Operating revenue Total operating revenues Total operating revenues Costs and Expenses [Abstract] Expenses Cost of Property Repairs and Maintenance Property operations and maintenance Real Estate Tax Expense Real estate taxes General and Administrative Expense General and administrative expenses (corporate office rent) General and Administrative Expense, Total General and administrative Business Combination, Acquisition Related Costs Acquisition related costs Acquisition costs Asset Impairment Charges Impairment charge Asset Impairment Charges, Total Impairment loss Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Depreciation and amortization Depreciation expense during the period Costs and Expenses Total operating expenses Operating Income (Loss) Income from operations Income from operations Nonoperating Income (Expense) [Abstract] Other income (expenses) Interest Expense Interest expense Interest Expense, Total Interest expense Investment Income, Interest Interest income Loss from Catastrophes Casualty loss Casualty loss Gain (Loss) on Disposition of Assets Gain on sale of land Gain on sale of land Gain (Loss) on Disposition of Assets, Total Income (Loss) from Equity Method Investments Equity in losses (income) of joint ventures Company's share in income of joint venture Equity in income of joint ventures Equity in (losses) income of joint ventures Income from continuing operations Income from continuing operations Income from continuing operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (loss) from discontinued operations Income from discontinued operations (including a gain on disposal of $6,944 in 2010 and loss on disposal of $1,636 in 2009) Total income from discontinued operations Income (loss) from discontinued operations Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income Net income Net income Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to noncontrolling interest Net income attributable to noncontrolling interest Net income attributable to noncontrolling interest Net income attributable to noncontrolling interest holders Net Income (Loss) Attributable to Parent Net income Net income attributable to common shareholders Net income attributable to common shareholders Net loss Earnings Per Share, Basic [Abstract] Earnings per common share attributable to common shareholders - basic Income (Loss) from Continuing Operations, Per Basic Share Basic Earnings per Common Share from continuing operations attributable to common shareholders Income (Loss) from Continuing Operations, Per Outstanding Share, Total Continuing operations Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share Discontinued operations Discontinued operations Earnings per share - basic Basic Earnings per share - basic Earnings per share-basic Earnings Per Share, Diluted [Abstract] Earnings per common share attributable to common shareholders - diluted Income (Loss) from Continuing Operations, Per Diluted Share Diluted Earnings per Common Share from continuing operations attributable to common shareholders Continuing operations Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share Discontinued operations Discontinued operations Diluted Earnings per share-diluted Earnings per share - diluted Diluted Earnings per Common Share attributable to common shareholders Common Stock, Dividends, Per Share, Declared Dividends declared per common share Dividends declared per common share Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax (Gain) loss on sale of storage facilities Gain (Loss) on disposal from discontinued operations Gain (loss) on disposal from discontinued operations Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax, Total Net realized gain (loss) on sale of property Consolidated Statements Of Comprehensive Income [Abstract] Statements Of Comprehensive Incomes [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income: Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax Change in fair value of derivatives (Loss) Gain included in other comprehensive income (loss) Change in fair value of derivatives net of reclassification to interest expense Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to noncontrolling interest Comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income attributable to common shareholders Consolidated Statements Of Shareholders' Equity [Abstract] Shares, Issued Balance, Shares Balance, Shares Stock Issued During Period, Value, New Issues Net proceeds from the issuance of common stock Stock Issued During Period, Shares, New Issues Net proceeds from the issuance of common stock, shares Stock issued during period value dividend reinvestment plan and stock purchase plan. Stock Issued During Period Value Dividend Reinvestment Plan And Stock Purchase Plan Net proceeds from issuance of stock through Dividend Reinvestment and Stock Purchase Plan Stock issued during period shares dividend reinvestment plan and stock purchase plan. Stock Issued During Period Shares Dividend Reinvestment Plan And Stock Purchase Plan Net proceeds from issuance of stock through Dividend Reinvestment and Stock Purchase Plan, shares Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised, Options Exercise of stock options, shares Stock option exercised by employees Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Issuance of non-vested stock Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issuance of non-vested stock, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total Adjustments To Additional Paid In Capital Earned portion of non-vested stock. Adjustments To Additional Paid In Capital Earned Portion Of Nonvested Stock Earned portion of non-vested stock Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock option expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Total Stock Issued During Period, Value, Share-based Compensation Net proceeds from issuance of stock through Stock Option Plan and "at the market" offering Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures, Total Deferred compensation outside directors Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Deferred compensation outside directors, shares Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures, Total Non-vested shares issued to outside directors Adjustments to additional paid in capital carrying value less than redemption value on redeemed partnership units. Adjustments To Additional Paid In Capital Carrying Value Less Than Redemption Value On Redeemed Partnership Units Carrying value less than redemption value on redeemed partnership units Adjustments to additional paid in capital carrying value less than redemption value on redeemed non controlling interest Adjustments To Additional Paid In Capital Carrying Value Less Than Redemption Value On Redeemed Non Controlling Interest Carrying value less than redemption value on redeemed noncontrolling interest Noncontrolling Interest, Change in Redemption Value Adjustment to redemption value Adjustment to redemption value Adjustment to redemption value of noncontrolling redeemable Operating Partnership Units Dividends Dividends Dividends Consolidated Statements Of Cash Flows [Abstract] Consolidated Statements Of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Operating Activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, Depletion and Amortization Depreciation expense during the period Depreciation, Depletion and Amortization, Total Depreciation and amortization Amortization of Financing Costs Amortization of deferred financing fees Equity Method Investment, Dividends or Distributions Distributions from unconsolidated joint venture Restricted Stock Expense Non-vested stock earned Stock based compensation expense related to amortization of non-vested stock Stock Option Plan Expense Stock option expense Stock based compensation expense related to stock options Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities (excluding the effects of acquisitions): Increase (Decrease) in Accounts Receivable Accounts receivable Accounts receivable Increase (Decrease) in Prepaid Expense Prepaid expenses Prepaid expenses Accounts payable and other liabilities Accounts payable and other liabilities Accounts payable and other liabilities Increase (Decrease) in Deferred Revenue Deferred revenue Deferred revenue Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] Investing Activities Payments to Acquire Real Estate Acquisition of storage facilities Cash Paid Payments to Acquire Real Estate, Total Acquisitions of storage facilities Improvements, equipment additions, and construction in progress. Improvements Equipment Additions And Construction In Progress Improvements, equipment additions, and construction in progress Improvements, equipment additions, and construction in progress Proceeds from Sale of Real Estate Held-for-investment Net proceeds from the sale of storage facilities Proceeds from Sale of Real Estate Held-for-investment, Total Net proceeds from the sale of storage facilities Proceeds from Sale of Land Held-for-use Net proceeds from the sale of land Proceeds from Insurance Settlement, Investing Activities Casualty insurance proceeds received Payments to Acquire Real Estate and Real Estate Joint Ventures Investment in unconsolidated joint venture Investment in joint ventures Advances reimbursement of advances to joint ventures Advances reimbursement of advances to joint ventures (Advances) reimbursement of advances to joint ventures (Advances) reimbursement of advances to joint ventures Payments for (Proceeds from) Deposits on Real Estate Acquisitions Property deposits Property deposits Reimbursement of property deposits Proceeds from Collection of Advance to Affiliate Receipts from related parties Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Financing Activities Proceeds from Issuance or Sale of Equity Net proceeds from issuance of stock through Stock Option Plan Proceeds from Issuance or Sale of Equity, Total Net proceeds from sale of common stock Proceeds from Long-term Lines of Credit Proceeds from line of credit Proceeds from line of credit and term notes Proceeds from Issuance of Medium-term Notes Proceeds from term notes Repayments of Long-term Lines of Credit Repayment of line of credit Repayments of borrowings on line of credit Repayments of Medium-term Notes Repayment of term notes Repayment of term notes Payments of Financing Costs Financing costs Financing costs Payments of Financing Costs, Total Unsecured revolving line of credit, fees paid Payments of Dividends, Common Stock Dividends paid - common stock Dividends paid-common stock Payments of Dividends, Noncontrolling Interest Distributions to noncontrolling interest holders Distributions to noncontrolling interest holders Redemption Of Operating Partnership Units. Redemption Of Operating Partnership Units Redemption of operating partnership units Redemption Of Operating Partnership Units Other Stockholders Equity. Other Stockholders Equity Additional investment in Locke Sovran II, LLC Repayments of First Mortgage Bond Mortgage principal payments Mortgage principal payments Net Cash Provided by (Used in) Financing Activities Net cash provided by (used in) financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash Net increase in cash Supplemental Cash Flow Information [Abstract] Supplemental cash flow information Interest Paid Cash paid for interest, net of interest capitalized Interest Paid, Total Cash paid for interest Organization [Abstract] Organization Organization ORGANIZATION Summary Of Significant Accounting Policies [Abstract] Basis of Presentation and Significant Accounting Policies [Text Block] Basis Of Presentation Summary Of Significant Accounting Policies Earnings Per Share [Abstract] Computation of basic and diluted earnings per common share Earnings Per Share [Text Block] Earnings Per Share EARNINGS PER SHARE Investment In Storage Facilities [Abstract] Real Estate Disclosure [Text Block] Investment In Storage Facilities INVESTMENT IN STORAGE FACILITIES Discontinued Operations [Abstract] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Discontinued Operations DISCONTINUED OPERATIONS Unsecured Line Of Credit And Term Notes [Abstract] Long-term Debt [Text Block] Unsecured Line Of Credit And Term Notes UNSECURED LINE OF CREDIT AND TERM NOTES Mortgages Payable And Other Debt Disclosures [Abstract] Mortgage Notes Payable Disclosure [Text Block] Mortgages Payable And Other Debt Disclosures Derivative Financial Instruments [Abstract] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Financial Instruments DERIVATIVE FINANCIAL INSTRUMENTS Fair Value Measurements [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurements Stock Based Compensation [Abstract] Disclosure Of Compensation Related Costs Share Based Payments Text Block Stock Based Compensation STOCK BASED COMPENSATION Retirement Plan [Abstract] Pension and Other Postretirement Benefits Disclosure [Text Block] Retirement Plan Investment In Joint Ventures [Abstract] Equity Method Investments Disclosure [Text Block] Investment In Joint Ventures INVESTMENT IN JOINT VENTURES Shareholders' Equity [Abstract] Stockholders' Equity Note Disclosure [Text Block] Shareholders' Equity Supplementary Quarterly Financial Data [Abstract] Quarterly Financial Information [Text Block] Supplementary Quarterly Financial Data Commitments And Contingencies [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments And Contingencies COMMITMENT AND CONTINGENCIES Subsequent Events [Abstract] Subsequent Events [Text Block] Subsequent Events Combined Real Estate And Accumulated Depreciation [Abstract] Real Estate and Accumulated Depreciation Disclosure [Text Block] Combined Real Estate And Accumulated Depreciation Basis of presentation [Policy Text Block] Basis Of Presentation [Policy Text Block] Basis Of Presentation Cash and Cash Equivalents, Policy [Policy Text Block] Cash And Cash Equivalents Trade and Other Accounts Receivable, Policy [Policy Text Block] Accounts Receivable Revenue and expense recognition [Policy Text Block] Revenue And Expense Recognition [Policy Text Block] Revenue And Expense Recognition Other operating income [Policy Text Block] Other Operating Income [Policy Text Block] Other Operating Income Investment in storage facilities [Policy Text Block] Investment In Storage Facilities [Policy Text Block] Investment In Storage Facilities Other assets [Policy Text Block] Other Assets [Policy Text Block] Other Assets