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Stock Based Compensation - Narrative (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  | 0 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 17, 2011 | Feb. 17, 2011 Prior LTIP [Member] | Dec. 31, 2010 Prior LTIP [Member] | Dec. 31, 2012 Washington Real Estate Investment Trust 2007 Omnibus Long Term Incentive Plan [Member] | Dec. 31, 2012 New STIP [Member] | Dec. 31, 2012 New STIP [Member] Performance-Based Awards [Member] | Dec. 31, 2012 New STIP [Member] Service-Based Awards [Member] | Dec. 31, 2012 New LTIP [Member] | Dec. 31, 2012 New LTIP [Member] Minimum [Member] | Dec. 31, 2012 New LTIP [Member] Maximum [Member] | Dec. 31, 2012 New LTIP [Member] Unrestricted Share Units [Member] | Dec. 31, 2012 New LTIP [Member] Restricted Share Units [Member] | Dec. 31, 2012 Unrestricted Share Awards [Member] New LTIP [Member] | Dec. 31, 2012 Cash [Member] New STIP [Member] Performance-Based Awards [Member] | Dec. 31, 2012 Restricted Share Units [Member] New STIP [Member] Performance-Based Awards [Member] | Dec. 31, 2012 Restricted Share Units [Member] New STIP [Member] Service-Based Awards [Member] | Dec. 31, 2012 Restricted Share Units [Member] New LTIP [Member] | Dec. 31, 2012 Restricted Share Units [Member] New LTIP [Member] Performance-Based Awards [Member] | Dec. 31, 2012 Management [Member] Restricted Share Units [Member] Prior LTIP [Member] | Dec. 31, 2012 Officer [Member] Restricted Share Units [Member] Prior LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan in effect, period |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage payable In unrestricted shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  | 50.00% |  |  |  |  |  |
Percentage payable in restricted shares |  |  |  |  |  |  |  |  |  |  |  | 65.00% | 150.00% | 50.00% | 50.00% |  |  | 50.00% |  |  |  |  |
Percentage of awards earned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |
Award vesting period |  |  |  |  |  |  |  | 4 years | 3 years | 3 years | 3 years |  |  |  |  |  |  |  |  | 1 year |  | 5 years | 5 years
Percentage officer may elect to defer |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of employer contribution, restricted units |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation cost not yet recognized, period for recognition |  |  |  |  |  |  |  |  |  | 3 years | 4 years |  |  |  |  | 3 years |  |  |  |  | 4 years | 6 years | 5 years
Percentage of restricted shares subject to performance conditions |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance period |  |  |  |  |  |  |  | 1 year |  |  | 3 years |  |  |  |  |  |  |  |  |  |  | 1 year |
Percentage of potential award dependent upon market condition |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of potential award based upon strategic plan fulfillment |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |
Weighting for performance measurement based on cumulative 3-Year total shareholder return |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Weighting for performance measurement based on 20 peer comapnies |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, expected volatility rate | 58.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, risk free interest rate | 1.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, expected term |  |  |  |  |  |  |  |  |  |  |  | 3 years | 4 years |  |  |  |  |  |  |  |  |  |
Closing share price, date of grant |  |  |  | $ 30.91 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant date fair value as a percentage of base salary |  |  |  |  |  |  |  |  |  |  |  | 79.00% | 185.00% |  |  |  |  |  |  |  |  |  |
Number of restricted shares subsequent to adoption of new share-based compensation plan |  |  |  |  | 154,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other than options, nonvested, number, |  |  |  |  |  | 59,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trustee share-based compensation | $ 55 | $ 55 | $ 55 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 5,856 | $ 5,597 | $ 5,852 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph e(2)(d) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Closing Share Price, Date of Grant + References No definition available. + Details
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- Definition Grant Date Fair Value as a Percentage of Base Salary + References No definition available. + Details
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- Definition Number of Restricted Shares Subsequent to Adoption of New share-based Compensation Plan + References No definition available. + Details
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- Definition Percentage of Awards Earned + References No definition available. + Details
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- Definition Percentage of Employer Contribution, Restricted Units + References No definition available. + Details
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- Definition Percentage Officer May Elect to Defer + References No definition available. + Details
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- Definition Percentage of Potential Award Based Upon Strategic Plan Fulfillment + References No definition available. + Details
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- Definition Percentage Of Potential Award Dependent Upon Market Condition + References No definition available. + Details
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- Definition Percentage Of Restricted Shares Subject To Performance Conditions + References No definition available. + Details
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- Definition Percentage Payable in Restricted Shares + References No definition available. + Details
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- Definition Percentage Payable In Unrestricted Shares + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Plan in Effect, Period + References No definition available. + Details
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- Definition Weighting for Performance Measurement Based on 20 Peer Comapnies + References No definition available. + Details
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- Definition Weighting for Performance Measurement Based on Cumulative 3-Year Total Shareholder Return + References No definition available. + Details
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