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Accumulated Other Comprehensive Loss (Amounts Reclassified from AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Interest Expense - Amortization of IRPAs | $ 14,369 | $ 16,259
Total | (8,791) | (9,881)
Interest Rate Swap | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Protection Agreements |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Interest Expense - Amortization of IRPAs | 96 | 102
Interest Expense - Settlement Payments | 1,413 | 1,836
Total | $ 1,509 | $ 1,938

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