Share-Based and Long-Term Compensation Plans (Details) (USD $)	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)	600,000
Term of equity plan	10 years 0 months 0 days
Value of equity-incentive awards granted during the period	$ 222,000
Vesting period	4 years 0 months 0 days
Period of performance goals	3 years 0 months 0 days
Share-based comp footnote	371,000	1,400,000
Share-based compensation expense	371,000	1,389,000
Nonvested awards total compensation expense not yet recognized	1,400,000
Nonvested awards, period over which expense will be recognized	1 year 8 months 0 days
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target absolute return goal (in hundredths)	12.00%
Threshold relative return goal	RMS + 100 bps
Target relative return goal	RMS + 200 bps
Maximum relative return goal	RMS + 300 bps
Threshold absolute goal award earnings (in hundredths)	15.00%
Target absolute goal award earnings (in hundredths)	60.00%
Threshold relative goal award earnings (in hundredths)	20.00%
Target relative goal award earnings (in hundredths)	55.00%
Maximum absolute goal award earnings (in hundredths)	100.00%
Maximum relative goal award earnings (in hundredths)	100.00%
Annual performance achievement vesting percentage (in hundredths)	50.00%
Fair value of incentive awards at period end	2,500,000
Restricted shares and deferred incentive share unit activity [Roll Forward]
Balance at beginning of period (in shares)	454,070
Issued (in shares)	21,900
Vested (in shares)	(56,013)
Forfeited (in shares)	(121,534)
Balance at end of period (in shares)	298,423
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 9.83
Issued (in dollars per share)	$ 10.15
Vested (in dollars per share)	$ 21.55
Forfeited (in dollars per share)	$ 8.25
Balance at end of period (in dollars per share)	$ 8.30
Restricted Shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum absolute return goal (in hundredths)	14.00%
Restricted Shares [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold absolute return goal (in hundredths)	10.00%
Deferred Incentive Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of incentive awards at period end	465,000
Restricted shares and deferred incentive share unit activity [Roll Forward]
Balance at beginning of period (in shares)	27,370
Issued (in shares)	0
Vested (in shares)	(3,030)
Forfeited (in shares)	(5,875)
Balance at end of period (in shares)	18,465
Weighted Average Grant-Date Fair Value [Roll Forward]
Balance at beginning of period (in dollars per share)	$ 21.65
Issued (in dollars per share)	$ 0
Vested (in dollars per share)	$ 14.93
Forfeited (in dollars per share)	$ 13.99
Balance at end of period (in dollars per share)	$ 25.19
Long-term Cash Incentive [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Absolute compounded annual TRS threshold for achievement of performance goals, first condition (in hundredths)	(i) achieve an absolute compounded annual TRS that exceeds 14% AND (ii) achieve an absolute compounded annual TRS that exceeds the compounded annual return of the RMS by at least 500 basis points
Absolute compounded annual TRS threshold for achievement of performance goals, second condition	achieves an absolute compounded annual TRS that exceeds 19%, then the Company must achieve an absolute compounded annual TRS that exceeds the compounded annual return of the RMS by at least 600 basis points
Aggregate cash incentive earned, maximum	$ 7,100,000
Absolute compounded annual TRS goal (in hundredths)	23.00%

The absolute compounded annual TRS goal on achievement of the maximum cash incentive.

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The threshold absolute compounded annual TRS that must be exceeded as the first condition to achieve the performance goals for actual payment under the long-term cash incentive.

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The threshold absolute compounded annual TRS that must be exceeded as the second condition to achieve the performance goals for actual payment under the long-term cash incentive.

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The maximum aggregate cash incentive earned for actual payment under the long term cash incentive.

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No definition available.

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The annual vesting percentage of the awards.

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The fair value of incentive awards granted as of the balance sheet date.

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No definition available.

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Awards earned if the company achieves maximum performance or better, with relative to the absolute return goal and the relative return goal, respectively.

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The maximum absolute return goal.

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Maximum relative goal award earnings

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The maximum relative return goal.

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The performance period metric for equity compensation.

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No definition available.

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The aggregate amount of noncash, equity-based employee remuneration used in the footnote disclosures. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation.

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No definition available.

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The cumulative award earnings for target performance related to the absolute return goal.

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The target absolute return goal.

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The cumulative award earnings for target performance related to the relative return goal.

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The target relative return goal.

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The term of the equity compensation plan.

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The threshold absolute return goal.

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The threshold absolute performance award earnings if the company achieves threshold performance.

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The threshold relative goal award earnings if the company achieves threshold performance.

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The threshold relative return goal.

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-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.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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.

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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).

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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

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-SubTopic 10

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-Paragraph 2

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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.

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-Publisher FASB

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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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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Value of stock (or other type of equity) granted during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. This element is not the recognition of equity-based compensation expense in pursuant to FAS 123R. That element is AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue (Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value).

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-Name Accounting Standards Codification

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