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Accumulated Other Comprehensive Loss (Amounts Reclassified from AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Interest Expense - Amortization of IRPAs | $ 14,376 | $ 14,407 | $ 43,660 | $ 45,255
Total | 9,965 | 1,613 | 6,339 | 13,136
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 | 24 | 96 | 180 | 294
Interest Expense - Settlement Payments | 912 | 1,774 | 3,486 | 5,425
Total | $ 936 | $ 1,870 | $ 3,666 | $ 5,719

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