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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, 2016 | Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Payments made on interest rate swaps included in Income before taxes |  | $ 2,238 | $ 2,676
Total pretax amount reclassified |  | (20,359) | (20,758)
Income tax effect |  | 7,043 | 8,519
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | (13,501) | (12,213)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Valuation Adjustment [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Payments made on interest rate swaps included in Income before taxes | [1] | 281 | 486
Income tax effect |  | (107) | (190)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 174 | 296
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] | 165 | 396
Income tax effect |  | (49) | (139)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 116 | 257
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total pretax amount reclassified |  | (1,113) | (1,109)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Total pretax amount reclassified |  | $ 1,278 | $ 1,505
[1] | Included in Interest expense.
[2] | These accumulated other comprehensive income/ components are included in the computation of net periodic pension cost (see Note 4).

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