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Accumulated Other Comprehensive Income (Amounts Reclassified from AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest Expense - Amortization of IRPAs | $ 12,424 | $ 14,376 | $ 37,818 | $ 43,660
Total | (5,139) | 9,965 | 12,884 | 6,339
Interest Rate Swap | Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Protection Agreements |  |  |  |
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest Expense - Amortization of IRPAs | 24 | 24 | 71 | 180
Interest Expense - Settlement Payments | (102) | 912 | 458 | 3,486
Total | $ (78) | $ 936 | $ 529 | $ 3,666

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