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Consolidated Statements of Stockholders' Equity and Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Stockholder's Equity and Comprehensive Income
Unrealized gain on derivatives designated and qualified as cash flow hedges, tax	$ 2,718	$ 2,625	$ 1,537

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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