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Share Based and Deferred Compensation (Details Textuals) (USD $) | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  | 3 Months Ended | 6 Months Ended |  |  |
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Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 Stock Option [Member] | Jun. 30, 2011 Stock Option [Member] | Jun. 30, 2012 Stock Option [Member] Y | Jun. 30, 2011 Stock Option [Member] | Jun. 30, 2012 Restricted Share Awards [Member] | Jun. 30, 2011 Restricted Share Awards [Member] | Jun. 30, 2012 Restricted Share Awards [Member] Age Y | Jun. 30, 2011 Restricted Share Awards [Member] | Jun. 30, 2012 Restricted Performance Share Units Plan [Member] | Jun. 30, 2011 Restricted Performance Share Units Plan [Member] | Jun. 30, 2012 Restricted Performance Share Units Plan [Member] | Jun. 30, 2011 Restricted Performance Share Units Plan [Member] | Apr. 02, 2009 Restricted Performance Share Units Plan [Member] | Jun. 30, 2012 Employee Share Purchase Plan [Member] | Jun. 30, 2011 Employee Share Purchase Plan [Member] | Jun. 30, 2012 Employee Share Purchase Plan [Member] | Jun. 30, 2011 Employee Share Purchase Plan [Member] | Jun. 30, 2012 Deferred Compensation Plan [Member] | Jun. 30, 2011 Deferred Compensation Plan [Member] | Mar. 01, 2012 Executive Officer [Member] Restricted Share Awards [Member] | Mar. 01, 2012 Executive Officer [Member] Restricted Performance Share Units Plan [Member] | Mar. 02, 2011 Executive Officer [Member] Restricted Performance Share Units Plan [Member] | Mar. 04, 2010 Executive Officer [Member] Restricted Performance Share Units Plan [Member]
Share Based and Deferred Compensation (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 3,483,537 |  | 3,483,537 |  | 3,599,672 | 3,483,537 |  | 3,483,537 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested options |  |  |  |  |  | 671,783 |  | 671,783 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expenses |  |  |  |  |  | $ 1,600,000 |  | $ 1,600,000 |  | $ 4,700,000 |  | $ 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period over which options will be recognized |  |  |  |  |  |  |  | 1.3 |  |  |  | 2.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense, capitalized | 500,000 | 400,000 | 900,000 | 700,000 |  | 400,000 | 400,000 | 700,000 | 700,000 | 200,000 | 100,000 | 300,000 | 300,000 | 200,000 | 100,000 | 400,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense awards nominal amounts capitalized |  |  |  |  |  | 100,000 | 100,000 | 200,000 | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  | three to seven years from the initial grant date |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense recognized | 1,900,000 | 1,600,000 | 3,600,000 | 3,300,000 |  |  |  |  |  | 800,000 | 800,000 | 1,500,000 | 1,600,000 | 700,000 | 500,000 | 1,300,000 | 800,000 |  |  |  | 100,000 | 100,000 |  |  |  |  |  |
Vesting Period, Minimum |  |  |  |  |  |  |  |  |  |  |  | 3 Years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Period, Maximum |  |  |  |  |  |  |  |  |  |  |  | 7 Years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate share-based awards awarded to executives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250,000 |  | 1,250,000 |  |  |  | 194,858 | 262,713 | 123,107 | 119,766
Measurement period index percentage, minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Measurement period index percentage remaining amount compared to total shareholder return of Real Estate Investment Trusts within proxy peer group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Cliff Vesting, Minimum |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Voluntary termination of employment terms |  |  |  |  |  |  |  |  |  |  |  | after reaching age 57 and accumulating at least 15 years of service with the Company |  |  |  | after reaching age 57 and accumulating at least 15 years of service with the Company |  |  |  |  |  |  |  |  |  |  |  |
Age limit of voluntary termination of employment |  |  |  |  |  |  |  |  |  |  |  | 57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Service Period For Voluntary Termination |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares to be delivered at the end of the measurement period relative to the total shareholder return |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | equal a certain percentage (not to exceed 200%) of the participant's base units |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Delivered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 372,102 |  |  |  |  |  |  |  |  |  |
Maximum percentage of the participant's base units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |  |  |  |  |  |  |
Fair value of awards on the grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |
Share purchases made by employees under ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85% of the average closing price per share for a specified period |  |  |  |  |  |  |
Share purchases made by employees under ESPP, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |
Percentage of plan contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |
Amount of participant contribution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |
Purchase price of shares purchased under ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 | $ 100,000 | $ 200,000 | $ 200,000 |  |  |  |  |  |
Deferred Compensation Arrangement With Individual Increase In Compensation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 | 400,000 |  |  |  |
Deferred Compensation Arrangement With Individual Decrease In Compensation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 | $ 400,000 |  |  |  |
Number of shares to be issued under deferred compensation plan included in total shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 300,000 |  |  |  |

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- Definition Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year). + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including 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 -Subparagraph (c)(1)(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(1)(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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(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 4: 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 + Details
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