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Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 176,253	$ 22,938	$ 475,602
Other comprehensive income (loss), net of income taxes:
Foreign currency translation adjustments	4,689	(1,291)	(6,322)
Unrealized gain (loss) on available-for-sale securities	(274)	2,251	(2,468)
Tax benefit (expense), available-for-sale securities	88	(849)	946
Other comprehensive income (loss), net of income taxes	4,503	111	(7,844)
Comprehensive income	$ 180,756	$ 23,049	$ 467,758

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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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