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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 26,288	$ 20,945
Other comprehensive income, net of tax:
Unrealized losses on available-for-sale securities, net of taxes of $10 and $0 for March 31, 2014 and 2013, respectively	(16)	(8)
Unrealized (losses) gains on hedging derivatives, net of taxes of $17 and $31 for March 31, 2014 and 2013, respectively	(26)	40
Comprehensive income	$ 26,246	$ 20,977

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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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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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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