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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	$ 106,044	$ 131,260	$ 105,078
Other comprehensive income:
Change in fair value of derivative instrument, net of income tax	(611)
Change in net unrealized gains and losses on investments, net of income tax	(40)	(265)	384
Comprehensive income	$ 105,393	$ 130,995	$ 105,462

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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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