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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Unrealized gain (loss) on investments, tax expense (benefit)	$ 33	$ (145)	$ 66	$ (119)
Unrealized (loss) gain, tax (benefit) expense	(1,294)	1,781	(1,235)	188
Reclassification adjustment for (gains) losses included in net income, tax (expense) benefit	$ (395)	$ 565	$ (1,434)	$ 1,930

Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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- Definition

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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