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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 33,761	$ 39,304	$ 153,480	$ 135,063
Other comprehensive income, net of tax:
Unrealized gains (losses) on available-for-sale securities, net of taxes of $44 and $25 for the three months ended September 30, 2018 and 2017, respectively, and $6 and $257 for the nine months ended September 30, 2018 and 2017, respectively	(133)	40	(20)	416
Unrealized gains (losses) on hedging derivatives, net of taxes of $2 and $20 for the three months ended September 30, 2018 and 2017, respectively, and $81 and $65 for the nine months ended September 30, 2018 and 2017, respectively	(4)	(30)	248	(104)
Comprehensive income	$ 33,624	$ 39,314	$ 153,708	$ 135,375

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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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