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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 86,541	$ 85,139	$ 86,700	$ 65,715	$ 168,443	$ 66,635	$ 63,107	$ 52,070	$ 324,094	$ 350,255	$ 219,414
Unrealized investment gains (losses) on available-for-sale securities:
Change in unrealized holding gains (losses) on investment securities									(59,661)	(3,950)	20,500
Reclassification adjustment for realized investment (gains) losses included in net income									(45)	(1,589)	(3,955)
Foreign currency translation adjustments:
Change in unrealized foreign currency translation gains (losses)									(25,059)	17,383	6,689
Total other comprehensive income (loss) before income taxes									(84,765)	11,844	23,234
Income tax expense (benefit) related to items of other comprehensive income (loss)									(12,690)	(2,126)	5,871
Other comprehensive income (loss), net of income taxes									(72,075)	13,970	17,363
Total comprehensive income									$ 252,019	$ 364,225	$ 236,777

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