Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 49,868	$ 41,469	$ 62,856
Other comprehensive income (loss), net of tax:
Unrealized holding gains (losses)	10,058	(17,457)	6,878
Portion of other than temporary impairment losses recognized in other comprehensive income (loss)	(3)	(4)	(4)
Reclassification adjustment for gains included in net income	(14,809)	(1,985)	(37,177)
Unrealized foreign currency translation gains (losses)	58	140	(341)
Other comprehensive income (loss), net of tax	(4,696)	(19,306)	(30,644)
Comprehensive income, net of tax	$ 45,172	$ 22,163	$ 32,212