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Accumulated Other Comprehensive Loss (Amounts Reclassified from AOCI) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of Interest Rate Protection Agreements | $ 18,963 | $ 22,693
Write-off of Unamortized Settlement Amounts of Interest Rate Protection Agreements | (1,150) | 1
Total | (20,408) | (22,516)
Interest Rate Protection Agreements | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of Interest Rate Protection Agreements | 585 |
Write-off of Unamortized Settlement Amounts of Interest Rate Protection Agreements | 183 |
Total | $ 768 |

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