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Accumulated Other Comprehensive Income (AOCI) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Expense related to interest rate swaps included in Income |  | $ 4,784 | $ 4,356 | $ 13,843 | $ 10,957
Total pretax amount reclassified |  | 19,029 | 20,897 | 39,565 | 57,439
Income tax effect |  | 3,809 | 7,488 | 12,138 | 20,613
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | (15,269) | (13,069) | (27,225) | (36,937)
Prior service credit |  | (1,113) | (1,113) | (3,339) | (3,338)
Net actuarial loss |  | 1,350 | 1,296 | 4,050 | 3,870
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] | 295 | 1,100 | 1,238 | 1,686
Income tax effect |  | (112) | (418) | (470) | (641)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 183 | 682 | 768 | 1,045
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 | [2] | 237 | 183 | 711 | 532
Income tax effect |  | (71) | (55) | (213) | (160)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | $ 166 | $ 128 | $ 498 | $ 372
[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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