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Share-Based Compensation and Employee Benefit Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended |
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Dec. 31, 2013 Stock Options | Dec. 31, 2013 Restricted shares | Dec. 31, 2012 Restricted shares | Dec. 31, 2011 Restricted shares | Dec. 31, 2013 Performance share units Percentile_Rank | Dec. 31, 2012 Performance share units | Dec. 31, 2011 Performance share units | Mar. 04, 2010 Performance share units 2010 PSU Grants | Dec. 31, 2011 Performance share units 2010 PSU Grants | Mar. 03, 2011 Performance share units 2011 PSU Grants | Mar. 02, 2012 Performance share units 2012 PSU Grants | Mar. 01, 2013 Performance share units 2013 PSU Grants | May 31, 2010 Maximum Amended and Restated 2008 Omnibus Equity and Incentive Plan
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares of beneficial interest authorized to be issued |  |  |  |  |  |  |  |  |  |  |  |  | 5,900,000
Expiration period | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) |  | 434,643 | 648,378 | 669,858 |  |  |  |  |  |  |  |  |
Stock awards granted (in shares or units) |  | 193,833 | 177,662 | 320,284 |  |  |  | 100,645 |  | 56,883 | 54,070 | 69,579 |
Forfeited (in shares) |  | (9,541) | (17,019) | (18,058) |  |  |  |  | (58,105) |  |  |  |
Vested (in shares) |  | (241,487) | (374,378) | (323,706) |  |  |  |  |  |  |  |  |
Unvested at the end of the period (in shares) |  | 377,448 | 434,643 | 648,378 |  |  |  |  |  |  |  |  |
Restricted shares expected to vest (in shares) |  | 361,064 |  |  |  |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) |  | $ 29.67 | $ 33.13 | $ 32.77 |  |  |  |  |  |  |  |  |
Grant date fair value (in dollars per share) |  | $ 25.91 | $ 23.64 | $ 33.68 | $ 26.84 | $ 32.77 | $ 49.15 |  |  |  |  |  |
Forfeited (in dollars per share) |  | $ 27.59 | $ 31.43 | $ 34.23 |  |  |  |  |  |  |  |  |
Vested (in dollars per share) |  | $ 30.97 | $ 32.72 | $ 32.86 |  |  |  |  |  |  |  |  |
Unvested at the end of the period (in dollars per share) |  | $ 26.96 | $ 29.67 | $ 33.13 |  |  |  |  |  |  |  |  |
Restricted shares expected to vest (in dollars per share) |  | $ 27.02 |  |  |  |  |  |  |  |  |  |  |
Other Share-based Compensation Additional Disclosures |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of restricted common shares, forfeiture restrictions lapsed |  | $ 6.3 | $ 9.0 | $ 11.2 |  |  |  |  |  |  |  |  |
Aggregate grant date fair value |  |  |  |  |  |  |  | 5.4 |  | 2.8 | 1.8 | 1.9 |
Non-cash compensation charge recognized in connection with cancellations |  |  |  |  |  |  |  |  | $ 1.2 |  |  |  |
Potential earned PSUs payout for defined levels of performance under awards |  |  |  |  |  |  |  |  |  |  |  |  |
Earned PSUs payout (as a percent of PSUs granted) on 75th or greater percentile rank |  |  |  |  | 200.00% |  |  |  |  |  |  |  |
Earned PSUs payout (as a percent of PSUs granted) on 50th percentile rank |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Earned PSUs payout (as a percent of PSUs granted) on 25th percentile rank |  |  |  |  | 50.00% |  |  |  |  |  |  |  |
Performance share units granted on percentile rank below 25th (as a percent) |  |  |  |  | 0.00% |  |  |  |  |  |  |  |
The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25% |  |  |  |  | 2 |  |  |  |  |  |  |  |
Performance period of the award |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Assumptions used to value stock awards |  |  |  |  |  |  |  |  |  |  |  |  |
Baseline value per common share (in dollars per share) |  |  |  |  | $ 25.85 | $ 24.39 | $ 35.17 |  |  |  |  |  |
Expected volatility of common shares (as a percent) |  |  |  |  | 29.50% | 43.20% | 61.10% |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  |  |  | 0.33% | 0.41% | 1.32% |  |  |  |  |  |

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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 non-cash compensation expense recognized during the reporting period for equity-based payment instruments, excluding stock (or unit) options, in connection with the cancellation of such instruments. + References No definition available. + Details
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- Definition Represents the number of expected to vest equity-based payment instruments, excluding stock (or unit) options, as of the balance sheet date. + References No definition available. + Details
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- Definition Represents the weighted average grant date fair value of expected to vest equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition The aggregate fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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- Definition The total intrinsic value of equity-based payment equity instruments, excluding stock (or unit) options, that vested during the reporting period as calculated by applying the disclosed pricing methodology. + References No definition available. + Details
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- Definition Represents the baseline common share value that is used in valuing the grant date fair value of awards. + References No definition available. + Details
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- Definition Represents the earned performance share units payout, as a percentage of performance share units granted, if the entity's total shareholder return relative to a peer group of companies ranks at the 25th percentile. + References No definition available. + Details
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- Definition Represents the earned performance share units payout, as a percentage of performance share units granted, if the entity's total shareholder return relative to a peer group of companies ranks at the 50th percentile. + References No definition available. + Details
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- Definition Represents the earned performance share units payout, as a percentage of performance share units granted, if the entity's total shareholder return relative to a peer group of companies ranks at the 75th percentile or greater. + References No definition available. + Details
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- Definition Represents the earned performance share units payout percentage based on percentile rank below 25. + 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 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 were forfeited 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(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 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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 + 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 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 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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