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Accumulated Other Comprehensive Income (Amounts Reclassified from AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest Expense - Amortization of IRPAs | $ 12,603 | $ 14,915 | $ 25,394 | $ 29,284
Total | 11,619 | 5,165 | 18,023 | (3,626)
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 | 23 | 60 | 47 | 156
Interest Expense - Settlement Payments | 97 | 1,161 | 560 | 2,574
Total | $ 120 | $ 1,221 | $ 607 | $ 2,730

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