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Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Comprehensive Income Parenthetical [Abstract]
Change in value of derivative instruments used as cash flow hedges, tax	$ 12,094	$ 18,412	$ 13,254
Reclassification - derivative settlements, tax	(20,171)	(1,146)	(19,987)
Ineffective portion of derivatives, tax	$ 1,008	$ (1,061)	$ (267)

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).

+ References+ Details