STOCK-BASED COMPENSATION Restricted Stock Units (Details) (USD $)	1 Months Ended	12 Months Ended
Dec. 31, 2010	Dec. 31, 2011
Restricted Stock Units Additional Disclosures
Fair value of units vested		$ 1,200,000
Restricted Stock Units (RSUs)
Restricted Stock Units Activity
Unvested Units		468,375
Granted		12,394
Vested	0	(67,135)
Unvested Units	468,375	413,634
Aggregate Intrinsic Value of Unvested Units		7,090,000
Weighted Average Remaining Vesting period		35 months 28 days
Weighted Average Grant Date Fair Value Per Unit
Unvested Units (dollars per share)	$ 17.12	$ 17.32
Granted (dollars per share)		$ 16.74
Vested (dollars per share)		$ 18.36
Unvested Units (dollars per share)	$ 17.32	$ 17.14
Restricted Stock Units Additional Disclosures
Forfeited Units		0
Time-Based Units
Restricted Stock Units Activity
Unvested Units		97,643
Granted		928
Vested		0
Unvested Units		98,571
Aggregate Intrinsic Value of Unvested Units		1,700,000
Weighted Average Remaining Vesting period		46 months 15 days
FFO Units
Restricted Stock Units Activity
Unvested Units		97,639
Granted		927
Vested		0
Unvested Units		98,566
Aggregate Intrinsic Value of Unvested Units		1,700,000
Weighted Average Remaining Vesting period		36 months
FFO Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting percentage		0.00%
FFO Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting percentage		200.00%
TSR Units
Restricted Stock Units Activity
Unvested Units		97,642
Granted		927
Vested		0
Unvested Units		98,569
Aggregate Intrinsic Value of Unvested Units		1,635,000
Weighted Average Remaining Vesting period		36 months
TSR Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting percentage		0.00%
TSR Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting percentage		150.00%
Carry-Over Units
Restricted Stock Units Activity
Unvested Units		74,717
Granted		0
Vested		(31,144)
Unvested Units		43,573
Aggregate Intrinsic Value of Unvested Units		771,000
Weighted Average Remaining Vesting period		19 months 10 days
Make-Whole Units
Restricted Stock Units Activity
Unvested Units		86,878
Granted		0
Vested		(21,719)
Unvested Units		65,159
Aggregate Intrinsic Value of Unvested Units		1,124,000
Weighted Average Remaining Vesting period		34 months 15 days
Initial Board Award
Restricted Stock Units Activity
Unvested Units		8,752
Granted		0
Vested		(4,368)
Unvested Units		4,384
Aggregate Intrinsic Value of Unvested Units		80,000
Weighted Average Remaining Vesting period		11 months 13 days
Annual Board Award
Restricted Stock Units Activity
Unvested Units		5,104
Granted		9,612
Vested		(9,904)
Unvested Units		4,812
Aggregate Intrinsic Value of Unvested Units		$ 80,000
Weighted Average Remaining Vesting period		5 months 13 days
Performance Incentive Plan of 2009 \| Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		3 years
Performance Incentive Plan of 2009 \| Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period		5 years

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Percentage

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Intrinsic Value

+ References

No definition available.

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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.

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- Definition

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

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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).

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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)

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

-Subparagraph c(1)

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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

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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

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-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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

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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.

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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.

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