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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 29,016	$ 22,545	$ 78,373	$ 62,554
Other comprehensive income, net of tax:
Unrealized gains (losses) on available-for-sale securities, net of taxes of $8 and $0 for the three months ended September 30, 2014 and 2013, respectively, and $10 and $0 for the nine months ended September 30, 2014 and 2013, respectively	12	26	(16)	15
Unrealized gains (losses) on hedging derivatives, net of taxes of $39 and $56 for the three months ended September 30, 2014 and 2013, respectively, and $73 and $310 for the nine months ended September 30, 2014 and 2013, respectively	61	(75)	(113)	448
Comprehensive income	$ 29,089	$ 22,496	$ 78,244	$ 63,017

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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