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The estimated net amount of existing gains (losses) on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

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- Definition

The income statement location of the effective portion of net gain or loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph b

-Clause 3

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

No definition available.

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- Definition

Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

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- Definition

Aggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

+ References

No definition available.

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Derivative Instruments (Details) (USD $)	12 Months Ended
Derivative Instruments (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative Instruments (Textuals) [Abstract]
Hedging losses included in accumulated other comprehensive income	$ 2,016,000
Notional amount of interest rate swap	135,445,000
Number of interest rate swaps	8
Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Impact of derivative instruments on the statement of operations and OCI
Gain (loss) on interest rate swap recognized in OCI (effective portion)	3,189,000	(10,307,000)	(3,513,000)
Realized Loss [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Impact of derivative instruments on the statement of operations and OCI
Gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing)	0	0	0
Interest Expense [Member] \| Interest Rate Swap [Member] \| Cash Flow Hedging [Member]
Impact of derivative instruments on the statement of operations and OCI
Gain (loss) reclassified from AOCI into income (effective portion)	1,781,000	(2,244,000)	(971,000)
Other Liabilities [Member]
Fair value of derivative instruments
Cash flow hedge interest rate swaps	$ 2,854,000	$ 482,000