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Accumulated Other Comprehensive Income/(Loss) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Total pretax amount reclassified |  | $ 2,484 | $ (18,393) | $ (18,274) | $ (36,543)
Income tax effect |  | (364) | 7,216 | 8,155 | 14,673
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 2,172 | (11,219) | (10,041) | (21,840)
Derivative Valuation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Payments made on interest rate swaps included in earnings | [1] | 467 | 473 | 953 | 951
Income tax effect |  | (182) | (184) | (372) | (371)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 285 | 289 | 581 | 580
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Total pretax amount reclassified |  | (1,111) | (1,108) | (2,220) | (2,217)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Total pretax amount reclassified |  | 1,461 | 1,355 | 2,966 | 2,683
Pension and Postretirement Liability Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Total pretax amount reclassified | [2] | 350 | 247 | 746 | 466
Income tax effect |  | (122) | (98) | (261) | (186)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | $ 228 | $ 149 | $ 485 | $ 280
[1] | Included in Interest expense.
[2] | These accumulated other comprehensive income/ (loss) components are included in the computation of net periodic pension cost (see Note 4).

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