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Unaudited Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 21,212	$ 29,647	$ 45,201	$ 65,438
Other comprehensive income:
Change in fair value of derivative instrument, net of income tax	94	(645)	53	(645)
Unrealized loss on investment, net of income tax				(40)
Comprehensive income	$ 21,306	$ 29,002	$ 45,254	$ 64,753

X

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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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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Net of tax amount of unrealized holding gain (loss) before reclassification adjustments and transfers on available-for-sale securities.

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