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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 20,945	$ 14,469
Other comprehensive income, net of tax:
Unrealized losses on available-for-sale securities, net of taxes of $0 for March 31, 2013	(8)
Unrealized gains on hedging derivatives, net of taxes of $31 and $20 for March 31, 2013 and 2012, respectively	40	27
Comprehensive income	$ 20,977	$ 14,496

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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