Balance Sheet Parentheticals (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Accumulated depreciation	$ 964,606	$ 982,564
Allowance for doubtful acounts	344	696
Accumulated amortization of deferred expenses	11,850	17,892
Debt discount	$ 36,740	$ 53,193
Units of redeemable units issued	640	285
Units of redeemable units outstanding	640	285
Common units issued	124,569	101,038
Series A Cumulative Convertible Preferred Units [Member]
Preferred Units issued	12,880	12,880
Preferred Units outstanding	12,880	12,880
Series C Cumulative Redeemable Preferred Units [Member]
Preferred Units issued	68	68
Preferred Units outstanding	68	68

Total number of common units of an entity that have been sold or granted to unitholders. These shares represent capital invested by the firm's unit holders and owners, and may be all or only a portion of the number of units authorized.

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The number of redeemable units issued

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The number of redeemable units outstanding

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For an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
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- Definition

The number of preferred units issued.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
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The number of preferred units outstanding.

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- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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