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Condensed Statements of Comprehensive Earnings (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Comprehensive Earnings (Parentheticals) [Abstract]
Amortization of Accumulated other comprehensive loss related to de-designated hedges, income taxes	$ 0	$ 777

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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