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Stock Based Compensation - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Apr. 23, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Trustee share-based compensation | $ 100,000 | $ 55,000 | $ 55,000 |
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost | 5,100,000 | 5,000,000 | 6,200,000 |
Capitalized Share-based Compensation During Period | 600,000 |  |  |
Fair value of restricted share units vested | $ 5,800,000 | $ 6,100,000 | 3,800,000 |
Restricted Share Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation cost not yet recognized, period for recognition | 20 months |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 1,800,000 |  |  |
Washington Real Estate Investment Trust 2007 Omnibus Long Term Incentive Plan [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 |  |  |
Options outstanding | 0 |  |  |
New STIP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of Potential Award Based Upon Service Requirement | 50.00% |  |  |
Awards, Vested after Performance Period, Percentage | 50.00% |  |  |
Performance period | 1 year |  |  |
New STIP [Member] | Performance-Based Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
New LTIP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage payable In unrestricted shares | 75.00% |  |  |
Percentage payable in restricted shares | 25.00% |  |  |
Award vesting period | 3 years |  |  |
Performance period | 3 years |  |  |
Total compensation cost not yet recognized, period for recognition | 4 years |  |  |
Grant date fair value as a percentage of base salary | 150.00% |  |  |
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 |  | 23.20% |  |
Fair value assumptions, risk free interest rate |  | 0.80% |  |
Closing share price, date of grant |  |  |  | $ 24.08
Grant Date Fair Value as a Percentage of Base Salary on absolute TSR | 50.00% | 50.00% |  |
Grant Date Fair Value as a Percentage of Base Salary on relative TSR | 50.00% | 50.00% |  |
New LTIP [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair value as a percentage of base salary | 80.00% |  |  |
Fair value assumptions, expected volatility rate | 17.20% |  |  |
Fair value assumptions, risk free interest rate | 1.00% |  |  |
Fair value assumptions, expected term | 3 years | 3 years |  |
Closing share price, date of grant | $ 27.66 |  |  |
Grant Date Fair Value as a Percentage of Base Salary on absolute TSR | 15.00% | 20.00% |  |
Grant Date Fair Value as a Percentage of Base Salary on relative TSR | 36.00% | 35.00% |  |
New LTIP [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value assumptions, expected volatility rate | 17.50% |  |  |
Fair value assumptions, risk free interest rate | 1.10% |  |  |
Fair value assumptions, expected term | 4 years | 4 years |  |
Closing share price, date of grant | $ 27.76 |  |  |
Grant Date Fair Value as a Percentage of Base Salary on absolute TSR | 29.00% | 38.00% |  |
Grant Date Fair Value as a Percentage of Base Salary on relative TSR | 69.00% | 67.00% |  |
Cash [Member] | New STIP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage payable In unrestricted shares | 100.00% |  |  |
Cash [Member] | New STIP [Member] | Performance-Based Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage payable In unrestricted shares | 50.00% |  |  |
Unrestricted Share Awards [Member] | New LTIP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation cost not yet recognized, period for recognition | 3 years |  |  |
Restricted Share Units [Member] | New STIP [Member] | Performance-Based Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage payable in restricted shares | 50.00% |  |  |
Restricted Share Units [Member] | New LTIP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period | 1 year |  |  |
Restricted Share Units [Member] | New LTIP [Member] | Performance-Based Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total compensation cost not yet recognized, period for recognition | 4 years |  |  |
Chief Executive Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost |  |  | $ 1,000,000 |
One Year [Member] | New LTIP [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant Date Fair Value as a Percentage of Base Salary on absolute TSR |  | 10.00% |  |
Grant Date Fair Value as a Percentage of Base Salary on relative TSR |  | 11.00% |  |
One Year [Member] | New LTIP [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant Date Fair Value as a Percentage of Base Salary on absolute TSR |  | 20.00% |  |
Grant Date Fair Value as a Percentage of Base Salary on relative TSR |  | 20.00% |  |
Two Year [Member] | New LTIP [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant Date Fair Value as a Percentage of Base Salary on absolute TSR |  | 16.00% |  |
Grant Date Fair Value as a Percentage of Base Salary on relative TSR |  | 23.00% |  |
Two Year [Member] | New LTIP [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant Date Fair Value as a Percentage of Base Salary on absolute TSR |  | 30.00% |  |
Grant Date Fair Value as a Percentage of Base Salary on relative TSR |  | 43.00% |  |

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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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 + 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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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 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 Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=27013229&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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