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Accumulated Other Comprehensive Income/(Loss) (Schedule of Items Reclassified to Statement of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Total pretax amount reclassified |  | $ (21,923) | $ (18,536) | $ (40,197) | $ (55,079)
Income tax effect |  | 12,243 | 6,762 | 20,398 | 21,435
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | (9,658) | (11,812) | (19,699) | (33,652)
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] | 587 | 480 | 1,540 | 1,431
Income tax effect |  | (229) | (187) | (601) | (558)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 358 | 293 | 939 | 873
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 |  | (1,110) | (1,108) | (3,330) | (3,325)
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 |  | 1,462 | 1,343 | 4,428 | 4,026
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] | 352 | 235 | 1,098 | 701
Income tax effect |  | (123) | (94) | (384) | (280)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | $ 229 | $ 141 | $ 714 | $ 421
[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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