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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 23,069	$ 19,064	$ 49,357	$ 40,009
Other comprehensive income, net of tax:
Unrealized losses on available-for-sale securities, net of taxes of $8 and $0 for the three months ended June 30, 2014 and 2013, respectively, and $18 and $0 for the six months ended June 30, 2014 and 2013, respectively	(12)	(3)	(28)	(11)
Unrealized (losses) gains on hedging derivatives, net of taxes of $95 and $335 for the three months ended June 30, 2014 and 2013, respectively, and $113 and $366 for the six months ended June 30, 2014 and 2013, respectively	(148)	483	(174)	523
Comprehensive income	$ 22,909	$ 19,544	$ 49,155	$ 40,521

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

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- Definition

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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