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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 Income And Comprehensive Income [Abstract]
Net income		$ 106,935	$ 99,410	$ 106,484
Other comprehensive income (loss)	[1]	127	(2,402)	(2,171)
Comprehensive income (loss)		$ 107,062	$ 97,008	$ 104,313
[1] Represents change in fair value of available for sale investments, net of income tax provision of $76 thousand for the year ended December 31, 2017 and a change in fair value of available for sale investments, net of income tax benefit of $1,486 thousand and $1,369 thousand for the years ended December 31, 2016 and 2015, respectively.

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- 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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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 and reclassification adjustments of other comprehensive income (loss).

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