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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Statement of Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |
Net unrealized gain (loss) on cash flow hedges, tax | $ 41 |  | $ 21 |  | $ 615 |  | $ 374 |
Net unrealized loss on investment securities, tax | (142) |  | 377 |  | (2,984) |  | 618 |
Amortization of pension and postretirement costs, tax | $ 4,347 | [1],[2] | $ 6,404 | [1],[2] | $ 15,613 | [1],[2] | $ 20,371 | [1],[2]
[1] | These items are included in the computation of net periodic costs of defined benefit pension plans and nonpension postretirement benefit plans (see Note 15 for additional details).
[2] | Amounts in parentheses indicate debits (reductions) to income.

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