Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ (971)	$ (15,345)	$ 44,949
Net unrealized investment gains (losses):
Unrealized holding gains (losses), net of tax provision of $0.4 million for the year ended December 31, 2018, and net of tax benefit of less than $0.1 million for the years ended December 31, 2017 and 2016, respectively		678	(84)	(97)
Reclassification adjustments included in net income, net of tax	[1]	19	(140)	0
Net unrealized investment gains (losses)		697	(224)	(97)
Currency translation adjustments, net of tax benefit of $0.3 million for the year ended December 31, 2018, and tax provision of $0.5 and $0.1 million for the years ended December 31, 2017 and 2016, respectively		(21,608)	32,905	(7,111)
Unrealized gains (losses) on cash flow hedges		(41)	32	8
Comprehensive income (loss)		$ (21,923)	$ 17,368	$ 37,749

[1] Tax effect was less than $0.1 million for each of the periods presented above.