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Share-Based Compensation and Other Compensation Matters (Details 6) |  |  |  |  | 12 Months Ended |
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Oct. 30, 2016 shares | Jul. 12, 2016 shares | May 30, 2016 shares | Mar. 05, 2015 shares | Dec. 31, 2016 USD ($) Percentile_Rank $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | May 31, 2010 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Decrease in tax benefit from share-based compensation | $ |  |  |  |  | $ 331,000 | $ 513,000 | $ 3,000 |
Executive transition costs | $ |  |  |  |  | $ 6,500,000 |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  |  |
Restricted shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation cost | $ |  |  |  |  | $ 5,600,000 |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized |  |  |  |  | 3 years |  |  |
Aggregate intrinsic value of vested shares | $ |  |  |  |  | $ 5,400,000 | $ 4,900,000 | $ 4,900,000 |
Vested (in shares) | shares |  |  |  |  | (215,983) | (202,781) | (182,213) |
Vested (in dollars per share) | $ / shares |  |  |  |  | $ 27.19 | $ 26.07 | $ 28.56 |
Restricted shares [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures (as a percent) |  |  |  |  | 0.00% |  |  |
Restricted shares [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures (as a percent) |  |  |  |  | 5.00% |  |  |
Performance share units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures (as a percent) |  |  |  |  | 0.00% |  |  |
Unrecognized compensation cost | $ |  |  |  |  | $ 873,000 |  |  |
Expected weighted average period during which unrecognized compensation cost will be recognized |  |  |  |  | 2 years |  |  |
Performance period of the award |  |  |  |  | 3 years |  |  |
The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25% | Percentile_Rank |  |  |  |  | 2 |  |  |
Deferred Share Award [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Estimated pre-vesting forfeitures (as a percent) |  |  |  |  | 0.00% |  |  |
Unrecognized compensation cost | $ |  |  |  |  | $ 241,000 |  |  |
Aggregate intrinsic value of vested shares | $ |  |  |  |  | $ 322,000 | $ 413,000 |  |
Vested (in shares) | shares |  |  |  |  | (12,028) | (15,485) |  |
Vested (in dollars per share) | $ / shares |  |  |  |  | $ 26.70 | $ 26.77 |  |
Options [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercised | $ |  |  |  |  |  | $ 300,000 | $ 225,000 |
Amended and Restated 2008 Omnibus Equity and Incentive Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of common shares of beneficial interest authorized to be issued | shares |  |  |  |  |  |  |  | 5,900,000.0
2012 PSU Grants [Member] | Performance share units [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for PSU Awards Vested in Period (in shares) | shares |  |  |  | 40,309 |  |  |  |
2013 and 2014 PSU Grants [Member] | Performance share units [Member] | Former Chief Financial Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for PSU Awards Vested in Period (in shares) | shares |  |  |  | 15,289 |  |  |  |
2014 and 2015 Performance Share Unit Grants [Member] | Performance share units [Member] | Executive Vice President [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for PSU Awards Vested in Period (in shares) | shares |  |  | 10,326 |  |  |  |  |
2014 and 2015 Performance Share Unit Grants [Member] | Performance share units [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for PSU Awards Vested in Period (in shares) | shares |  | 20,569 |  |  |  |  |  |
2014, 2015 and 2016 Performance Share Unit Grants [Member] | Performance share units [Member] | General Counsel [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares issued for PSU Awards Vested in Period (in shares) | shares | 2,248 |  |  |  |  |  |  |

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- Definition The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25%. + References No definition available. + Details
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- Definition Represents the estimated pre-vesting percentage of forfeitures considered for reduction in stock compensation expense recognized during the period. + References No definition available. + Details
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- Definition Period until equity-based award expires + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares issued for Awards Vested in Period + References No definition available. + Details
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- Definition Amount of decrease in additional paid in capital (APIC) resulting from a tax deficiency associated with a share-based compensation plan other than an employee stock ownership plan (ESOP). + References No definition available. + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 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 The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan 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 Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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