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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 203,319	$ 148,514	$ 131,411
Other comprehensive income (loss), net of tax:
Unrealized gains (losses) on hedging derivatives, net of taxes of $6, $94, and $230 for the years ended December 31, 2017, 2016 and 2015, respectively	11	(151)	(372)
Unrealized gains (losses) on available for sale securities, net of taxes of $108, $168 and $50 for the years ended December 31, 2017, 2016 and 2015, respectively	175	(270)	(82)
Comprehensive income	$ 203,505	$ 148,093	$ 130,957

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

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-Publisher FASB
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-Topic 220
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-Section 45
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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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