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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 229,011	$ 203,319	$ 148,514
Other comprehensive income, net of tax:
Unrealized gains (losses) on hedging derivatives, net of taxes of $39, $6, and $94 for the years ended December 31, 2018, 2017 and 2016, respectively	118	11	(151)
Unrealized gains (losses) on available for sale securities, net of taxes of $103, $108 and $168 for the years ended December 31, 2018, 2017 and 2016, respectively	309	175	(270)
Comprehensive income	$ 229,438	$ 203,505	$ 148,093

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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 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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