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Accumulated Other Comprehensive Income (AOCI) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Expense related to interest rate swaps included in Income |  | $ 4,625 | $ 4,238 | $ 9,060 | $ 6,602
Total pretax amount reclassified |  | 3,012 | 16,183 | 20,536 | 36,542
Income tax effect |  | 1,779 | 6,082 | 8,329 | 13,125
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | (1,117) | (10,367) | (11,956) | (23,868)
Prior service credit |  | (1,113) | (1,112) | (2,226) | (2,225)
Net actuarial loss |  | 1,353 | 1,296 | 2,700 | 2,574
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 | [1] | 240 | 184 | 474 | 349
Income tax effect |  | (72) | (56) | (142) | (105)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 168 | 128 | 332 | 244
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 | [2] | 343 | 305 | 943 | 586
Income tax effect |  | (130) | (116) | (358) | (223)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | $ 213 | $ 189 | $ 585 | $ 363
[1] | These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see Note 4).
[2] | Included in Interest expense are payments related to the interest rate swap agreements and amortization of swap buyouts (see Note 15).

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