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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Payments made on interest rate swaps included in income before taxes |  | $ 3,681 | $ 2,671 | $ 9,610 | $ 8,049
Income before income taxes |  | 20,897 | 21,923 | 57,439 | 40,197
Income tax effect |  | 7,488 | 12,243 | 20,613 | 20,398
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | (13,069) | (9,658) | (36,937) | (19,699)
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] | 1,100 | 587 | 1,686 | 1,540
Income tax effect |  | (418) | (229) | (641) | (601)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 682 | 358 | 1,045 | 939
Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension and Postretirement Liability Adjustments [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income before income taxes | [2] | 183 | 352 | 532 | 1,098
Income tax effect |  | (55) | (123) | (160) | (384)
Effect on net income due to items reclassified from Accumulated Other Comprehensive Income |  | 128 | 229 | 372 | 714
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] |  |  |  |  |
Income before income taxes |  | (1,113) | (1,110) | (3,338) | (3,330)
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] |  |  |  |  |
Income before income taxes |  | $ 1,296 | $ 1,462 | $ 3,870 | $ 4,428
[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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