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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income		$ 40,148	$ 40,055
Other comprehensive income (loss), net of taxes	[1]	11,984	(4,050)
Comprehensive income		$ 52,132	$ 36,005
[1] Represents change in fair value of available-for-sale investments, net of income tax provision of $3,916 thousand for the three months ended March 31, 2019 and a change in fair value of available-for-sale investments, net of income tax benefit of $1,219 thousand for the three months ended March 31, 2018.

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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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