Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income	$ 330	$ 6,756
Unrealized net gains (losses) on fixed income securities:
Unrealized net gains (losses) arising during the period	(2,998)	5,990
Less: reclassification adjustment for net gains included in net income	123	655
Change in unrealized gains (losses) on investments	(3,121)	5,335
Foreign currency translation adjustments	(223)	65
Other comprehensive income (loss)	(3,344)	5,400
Comprehensive income (loss)	$ (3,014)	$ 12,156