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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]
Increase in estimated fair value of investment in debt securities, tax	$ 0	$ 0	$ (187)	$ 1,126
Unrecognized actuarial loss and prior service cost, income taxes	232	209	1,157	1,343
Income tax on cash flow hedge activity	$ 33	$ 25	$ 195	$ 71

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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