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Derivative Instruments and Hedging Activities (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2009 | Dec. 31, 2011
Interest Rate Caps Purchased |  |  |  |  | $ 7,100,000 |  |
Derivative Cap Fixed Interest Rate |  |  |  |  | 2.97% |  |
Deposits, Money Market Deposits |  |  |  |  | 70,000,000 |  |
Derivative Asset, Fair Value, Net | 68,000 |  | 68,000 |  |  | 250,000 |
Interest Expense Hedged Deposits |  |  | 962,000 | 559,000 |  |  |
Unrealized Holding Losses on Cash Flow Hedging Activities | 421,000 | (714,000) | 780,000 | (337,000) |  |  |
Future Interest Expenses on Hedge Deposits |  |  | 2,100,000 |  |  |  |
Accounts Payable, Interest-Bearing | $ 428,000 |  | $ 428,000 |  |  | $ 428,000 | [1]
[1] | See Note 9 for further discussion.

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable to vendors that bear interest at either a stated or an imputed rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 + Details
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