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Accumulated Other Comprehensive Income (Loss) (Amounts Reclassified from AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Settlement Gain (Loss) on Interest Rate Protection Agreements | $ 1,896 | $ 0 | $ (11,546)
Interest Expense - Amortization of IRPAs | 57,199 | 59,430 | 67,424
Total | 71,029 | 5,553 | (33,223)
Interest Rate Swap | Reclassification out of Accumulated Other Comprehensive Loss | Interest Rate Protection Agreements |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Settlement Gain (Loss) on Interest Rate Protection Agreements | 0 | 0 | 12,990
Interest Expense - Amortization of IRPAs | 205 | 390 | 524
Interest Expense - Settlement Payments | 4,336 | 7,123 | 5,529
Total | $ 4,541 | $ 7,513 | $ 19,043

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