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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 191,164	$ 152,198	$ 403,072
Other comprehensive gain (loss) before tax:
Gains (losses) on hedging instrument	1,139	(220)	(918)
Other comprehensive gain (loss) before tax	1,139	(220)	(918)
Income tax expense (benefit) related to gains (losses) on hedging instrument	399	(77)	(321)
Comprehensive income, net of tax	$ 191,904	$ 152,055	$ 402,475

X

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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