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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Comprehensive Income
Change in fair value derivative instruments designated as cash flow hedges, income tax effect	$ (875)	$ 0
Amortization of loss on terminated derivative instruments designated as cash flow hedges, income tax effect	$ 277	$ 282

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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