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Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2011
Fair Value Measurements (Textuals) [Abstract] |  |
Reclassification of accumulated other comprehensive income as a component of loss on early retirement of debt |  | $ 2,760
Number of swap agreements used for hedging interest payments |  | 2
Interest Rate Swap [Member] | Loss on early retirement of debt [Member] |  |
Fair Value Measurements (Textuals) [Abstract] |  |
Reclassification of accumulated other comprehensive income as a component of loss on early retirement of debt | $ 2,760 | $ 2,760

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- Definition The amount of net gains (losses) on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income. + 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(1) + Details
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