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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 29,244	$ 33,342	$ 100,535	$ 93,297
Other comprehensive income, net of tax:
Unrealized gains (losses) on available-for-sale securities, net of taxes of $88 and $74 for the three months ended September 30, 2016 and 2015, respectively, and $5 and $7 for the nine months ended September 30, 2016 and 2015, respectively	(142)	118	(6)	13
Unrealized gains (losses) on hedging derivatives, net of taxes of $2 and $154 for the three months ended September 30, 2016 and 2015, respectively, and $203 and $267 for the nine months ended September 30, 2016 and 2015, respectively	(4)	(257)	(328)	(432)
Comprehensive income	$ 29,098	$ 33,203	$ 100,201	$ 92,878

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=51831270

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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 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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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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