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Accumulated Other Comprehensive Income (AOCI) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Expense related to interest rate swaps included in Income |  | $ 4,328 | $ 2,238
Total pretax amount reclassified (b) |  | 17,524 | 20,359
Income tax effect |  | 6,550 | 7,043
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | (10,839) | (13,501)
Prior service credit |  | (1,113) | (1,113)
Net actuarial loss |  | 1,347 | 1,278
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative valuation adjustment [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Expense related to interest rate swaps included in Income | [1] | 600 | 281
Income tax effect |  | (228) | (107)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 372 | 174
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension and postretirement liability adjustments [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total pretax amount reclassified (b) | [2] | 234 | 165
Income tax effect |  | (70) | (49)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | $ 164 | $ 116
[1] | Included in Interest expense are payments related to the interest rate swap agreements and amortization of swap buyouts (see Note 15).
[2] | These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 4).

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