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Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 19,610	$ 7,799	$ 132,460	$ 6,963
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustments	1,778	(203)	4,589	961
Unrealized gain (loss) on available-for-sale securities	272	(882)	(99)	3,051
Tax benefit (expense), available-for-sale securities	(104)	346	27	(1,185)
Other comprehensive income (loss), net of income taxes	1,946	(739)	4,517	2,827
Comprehensive income	$ 21,556	$ 7,060	$ 136,977	$ 9,790

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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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