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Accumulated Other Comprehensive Income (Amounts Reclassified from AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Settlement Gain on Derivative Instruments | $ 0 | $ 1,896 | $ 0
Interest Expense - Amortization of IRPAs | 50,775 | 57,199 | 59,430
Total | 27,382 | 71,029 | 5,553
Interest Rate Swap | Reclassification out of Accumulated Other Comprehensive Loss | Derivative Instruments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Interest Expense - Amortization of IRPAs | 96 | 205 | 390
Interest Expense - Settlement Payments | 109 | 4,336 | 7,123
Total | $ 205 | $ 4,541 | $ 7,513

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