Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Net tax benefit related to Tax Act	$ 11,000
Loss reserve discounting	130,513	$ 47,000	$ 70,206
GILTI tax	2,800
undistributed earnings of non-U.S. subsidiaries	$ 70,000